Q: car jerks/gas pedal

asked by on

I have a 2004 Altima 2.5S (Automatic). The car slightly jerks when shifting gears (much more noticeable in downhills) and that's frustrating in traffic because the car wants to change gear from 1 to 2 but I press the brake and that's a bad jerk. I have taken the car to 3 transmission shops and they all did a road test and said there's nothing wrong with the transmission. Also No fault code exists. At idle (P) when I give some gas to 3000 rpm, the rpm needle sticks at around 1500 on return for 1-2 second, then comes back down to 900. Looks like the gas stuck somewhere in engine. I had already cleaned the throttle body but no relief! Have this issue for 8-9 mounts and that's not getting worse nor getting better. Only one or 2 times when I turned the A/C on, the problem went away and the gas pedal became enough stiff and satisfactory. I think this problem appeared after I changed my dead alternator myself.

My car has 138 miles.
My car has an automatic transmission.

Hi, thanks for writing in. This is more than likely a fuel delivery issue, given the symptoms you describe. The idle air control valve is a unit that regulates the air flow into the engine as it is mixed with fuel prior to being injected into the motor. When this is not working properly, this will cause an imbalanced load of air and fuel to be supplied to the motor resulting in a loss of power or stall as you have experienced. This may also cause the car to have an irregular idle as you have described. I would recommend having an expert from YourMechanic come to your home or office to confirm a diagnosis on the issue and make or suggest the necessary repairs or replacements.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. car jerks/gas pedal

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

Get a quote

What others are asking

Q: Why would my ecm or tcm overheat

All the ECM's or PCM's will generate some normal heat from the transistors, processors, or chips. If you are having failure from a problem, then there should be codes stored inside the module that may indicate the problem. You may...

Q: Car whistling, rough idle.

This sounds exactly like the symptoms of a vacuum leak. When the engine inhales air through an opening it is not supposed to is a vacuum leak. The whistling sound is due to the air being drawn in through a...

Q: Q: What is wrong with my car?

Hi, it sounds like you are having a few issues with your car. The P0117 code you received is the coolant temp sensor failure. Although your gauge is not reading high, with the coolant temp sensor failing, the gauge will...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.