Skip the auto shop - Our mechanics make house calls

Q: my car is almost dying and at 40mph wont go over 2000rpms sometimes under that.

asked by on

i have a 2002 gmc envoy and recently i was driving it when all the sudden i hit 40 and my car started to vibrate really badly at 2000rpms while i was accelerating. i got to the top of the hill i was going up and pulled over and checked my oil and gauges and looked under the car and nothing out of the ordinary. I do however have a problem with my oil gauge currently where under 10 mph i loose all pressure in the gauge till i stop then it jumps up and down. i check my oil everyday and it seems fine. When i got home from the fist part of this inquiry it kept dropping below 500rpms and wanting to die so i had to keep revving it to park it. if it's anything super major i would like to know so that i can either A take it to a shop or B part it out and get something new. Mind you i have already put $1500 in sensors into it during summer when my gas tank sounded like it was boiling.

My car has 158000 miles.
My car has an automatic transmission.

Hi there. After reviewing your question, it is quite possible that you have an oil circulation or lubrication problem; possibly caused by an obstruction in the oil lines, faulty oil pump or too much debris (sludge) in the motor. When this occurs, sometimes the ECU will see the issue and trigger an error code. It is also possible that other mechanical component failures exist, so it’s probably best to have a professional mechanic complete a car is slow to accelerate inspection first, before you spend money on repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. my car is almost dying and at 40mph wont go over 2000rpms sometimes under that.

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: Reduce Engine power and nothing happens when pushing the gas pedal

Hi and thanks for contacting YourMechanic. The service 4x4 light indicates a loss of communication to the throttle position sensor, and a reduction in power is a prime indicator that the transfer case position sensor or selector switch has failed....

Q: Loud noise coming front front end.

You should have the tire n the left front checked to see if it is wearing incorrect causing the humming noise. The alignment on the front may be out from a loose upper or lower control ball joints or bushings....

Q: Have a 2004 Trailblazer with the 4.2L. Idles rough and throws a "P0300" "Engine Misfire" DTC... Suggestions?

It sounds like you could be having an issue with your fuel system. It is possible that the replacement of the fuel filter helped the issue but did not resolve it completely. I would recommend having your fuel pressure tested...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...