RPMs fluctuating 1991 v8-5.0l jerking mark vii lincoln ga...

Q: RPMs fluctuating

asked by on March 19, 2016

I have taken my car to many mechanics but can't seem to find the problem. My car starts fine, but when I start driving it randomly fluctuates between 500 RPMs and 1500 RPMs. I also sometimes get small surges, as if someone was pushing in the gas pedal. I will stall when stopped if I do not push the gas pedal. And the car will also begin jerking when the gas is pushed and released. None of this is consistent; it just happens randomly, daily, or weekly. I replaced the EGR valve and the idle control valve, but that did not solve any of the issues.

This sounds like there could possibly be a vacuum leak somewhere. My other guess is that the new idle air control valve may also be malfunctioning. If you switched out some parts lately, getting new car parts that are bad right out of the box is starting to become more common, especially with cheaper parts. I would recommend having a mechanic from YourMechanic come to you with their specialized diagnostic equipment to figure out why your car is stalling and acting up the way it has been.

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

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

Car won't start - 1998 Ford Explorer

Hello there. Many faults will cause your 1998 Ford Explorer not to start. You have done well in replacing the battery: this is the number one cause of vehicles not starting. The starter and coil are also common causes, but...

I have a very loud knocking sound from the front driver side of my 1991 Jeep Cherokee Laredo 4x4

Hi Taylor. Thanks for contacting us tonight. A loud knocking sound coming from your front wheels can be caused by wheel bearings or inner transaxle components. If the noise does not come on during reverse, then it's likely a forward...

Engine makes clicking sounds while idling and at lower speeds

Hey there. The first noise you described sounds like valve lifter noise. You will hear this sound if the engine is low on oil. Check the oil level and add if necessary. The lifter noise is not heard at higher...

Related articles

A Buyer's Guide to the 2012 Lincoln MKZ Hybrid
When When it comes to performance, there’s no argument: the 2012 Lincoln MKZ Hybrid is the leader in its class. Fortunately, it brings a number of other amazing features to the table too. Key Features Speaking of performance, let’s start...
How to Get Lincoln Dealership Certified
Lincoln dealerships offer automotive technician jobs to those who are Lincoln certified through UTI’s Ford Accelerated Credential Training program.
Lincoln Certified Pre-Owned (CPO) Car Program
Lincoln certified pre-owned cars are under 7 years old, have less than 60,000 miles, and come with a 6 year or 100,000 miles comprehensive warranty.