Q: Car is vibrating when accelerating - 2003 Chevrolet Trailblazer

asked by on November 04, 2016

When I press my gas from a stop it feels like I'm pressing on air like my car isn't getting power but while I'm pressing it the car is vibrating after a few seconds it stops then takes off like normal and it will continue doing this every few minutes or so I also lost my gas cap and left it off for about a month just got a new one 2 days ago don't know if that had anything to do with it just got my oil changed also and transmission fluid is full.

My car has 1128933 miles.
My car has an automatic transmission.

Hi there. There are several possibilities for the vibration and lack of power upon vehicle acceleration. The missing fuel cap should not affect drivability. Assuming the Check Engine Light has been on for the missing fuel cap, this leads me to believe the ECM (engine control module) may be recognizing the fault upon acceleration.

If the Check Engine Light flashes when the vibration is felt, this would indicate an engine misfire. This may be the result of a [faulty/worn spark plug](https://www.yourmechanic.com/services/spark-plugs-replacement or a faulty ignition coil. It could be also be a low fuel pressure situation caused by a faulty fuel pump or a faulty fuel pressure regulator. Accessing the ECM/computer for codes may help identify the area of concern.

I recommend having your vehicle’s vibration and lack of power be diagnosed and repaired by certified technician, such as one from YourMechanic.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

I noticed a leak of a clear brownish fluid from under the car. I coated the area with some white footpowder to determine the exact spot and it seems to be coming from right behind the lowest (to the ground) of my belt tensioner pullies I'm also leaking tranny fluid from a unknown hose on the truck behind the driver side of the engine.... I cant find where this hose connects to anything.... Is it possible it's a overflow? I have a 06 jeep grand cherokee lerado 4.6L if that makes a difference

My car won't go into drive or reverse either and there's a picture of a car tilted like its on a hill were the oil light and the little wrench that tells me I need an oil change is

My car is misfiring on several cylinders and there is coolant in my coil pack 5and 6

The presence of coolant suggests a leak and that should be resolved as a leak could be a cause of the misfiring if water creates a path to ground. If, by chance, you are referring to coolant actually in the...

2012 genesis 3.8 shifts hard. What cost am I looking at to replace transmission

The shift issue should be diagnosed first especially considering the low miles on the transmission. It would be unusual for a transmission with only 78,000 miles on it to require total replacement (versus on the vehicle service). Anytime you are...

Engine light fault. There was a bad spark plug and a failed ignition coil. Replaced both the coil pack or spark plug.

Hi there. If the light is coming on then shutting off and returning on, then if the issue is for the same coil, there could be an issue with the wiring on the coil plug. Check the wiring on the...

I think my four wheel drive is locked. What will cause this issue?

Hi there. There is an actuator on the front axle that engages the front axle to make the 4WD work. Your transmission is an all wheel drive transmission and the actuator is what disengages the front axle so the vehicle...

Cant get my car out of limp mode or "fail safe mode"

The reason "limp mode" has become "unbypassable" is due to the existing codes. The ECT failure, if it exists, may alone account for that because an engine coolant temperature sensor is essentially a master sensor - the value of which...

Does the Sorento alternator fit the 2009 Kia Borrego? I know that there was another part that was replaced and it was a Sorento

Hi there, thanks for writing in. My resource states that 2007-2009 V6 Sorento will work. It has a 2 pin connector. If your Borrego that has the upgraded entertainment system, it will have a 4 pin connector and the Sorento...

On right turn, car's engine shut down without warning

Hi there. There are some common issues with this vehicle that will cause this. Most of the time, if it occurs only when turning, it is because of a bad connection at the battery or at one of the control...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Malibu Hybrid
The The 2012 Chevrolet Malibu ECO hybrid is an interesting car in the world of mid-size family sedans. Unlike other popular hybrids, it doesn’t have a full-sized electric motor that takes over when the car starts. Instead, it uses eAssist...
A Buyer’s Guide to the 2012 Chevrolet Equinox
The The 2012 Chevrolet Equinox stands out in the small SUV class for its affordable price, its high-powered engine, and its plethora of features. While the Honda CR-V has led this class for years, the Chevrolet Equinox is positioned to...
The Best Used Cars to Buy for Senior Citizens
Everyone Everyone needs a way to get around. You need to get groceries, get to doctors’ appointments, visit with family and more. However, senior citizens have very different needs when it comes to buying a used car than other demographics....