Q: My car accelerates on its own and rpm goes high anf it happens for like 4 secs then goes back to normal

asked by on August 20, 2017

I have a 1998 gmc yukon 5.7 engine automatic transmission and when i use it after a while it starts accelerating on its own n rpm goes high n its hard to stop so i throw it on neutral and it does it for 5 second and becomes normal then after 10 min or more it does it again

My car has 175000 miles.
My car has an automatic transmission.

Engine idle speed is high Inspection $79.99 - $99.99 Get a Quote

It is possible that your throttle cable could be getting stuck causing the throttle to stay open. I would recommend visually inspecting the cable and lubricating it if necessary to resolve this issue. If this does not fix the problem, I would recommend having an engine runs rough inspection performed to determine the exact cause of this issue. Consider YourMechanic as this inspection can be completed at your home or office.

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 $65/hr

What others are asking

Chrysler 300c is misfiring and won't stay running but no lights are on

It is possible that you could have an issue with fuel delivery to the engine. It is also possible that you have a check engine light and the check engine light itself is burned out. I would recommend having your...

No crank at all, changed the starter & crankshaft position sensor still nothing.

Changing out parts for the no start may lead to replacing the correct part, but it may take a few parts and money. I suggest having a qualified mechanic come and diagnose the no start by checking fuel pressures or...

What would cause the temperature gauge to go cold to hot then back to cold

The engine temperature is regulated by the thermostat opening and closing to maintain the engine temperature. The cooling fan clutch also will maintain the engine temperature to keep a controlled air flow across the radiator to maintain the engine temperature....

Truck started in neutral once, now it won't start at all

This is just a guess, but the problem could be with the gear selector or the transmission position switch. The starter relay will not close and the vehicle will not crank, unless the switch is in the neutral or park...

1998 Nissan Cube (Japan) drive belt part number

The Nissan Cube was not sold in America until 2009. This model was a third generation compared to Japan's 1998 version which was the first generation. You may have to call the dealer or a local parts store to see...

Why does my Tahoe start with the fuel pump relay pulled out or left in?

Hi there. Check to see what relay you have pulled. If indeed you removed the fuel pump relay and the engine still starts up, then check the oil pressure switch. An oil pressure switch will kept the engine running as...

2002 GMC Envoy message displayed on message board, turn engine off now. What does this mean?

Hi there. The message could have came on for something that may have been active on the engine or transmission. If the light comes on again, then the computer (ECM) should store the events and you could have them read...

Car is leaking oil

This engine may have oil leaks from the valve covers, or any other engine gasket below the covers. When looking at oil leaks, the best practice is to look at the highest point of the leak, which may be leaking...

Engine not getting fuel.

Older vehicles such as your Suburban tend to be a little easier to diagnose. If you suspect a lack of fuel to be your issue you may very well be correct. One trick you can try yourself to verify this...

Related articles

How to Get Buick Dealership Certified
GM/Buick car dealerships offer automotive technician jobs to mechanics who are certified through the Universal Technical Institute (UTI) and GM.
A Buyer’s Guide to the 2012 GMC Sierra
The The 2012 GMC Sierra may not have sold quite as well as the Ford F-150, but that doesn’t mean you should dismiss this rugged and reliable model. For one thing, the Sierra is available in a half-ton version (1500)...
A Buyer’s Guide to the 2012 GMC Sierra Hybrid
When When you buy a truck – even a half-ton truck like a GMC Sierra 1500 – you expect to make a trade-off between hauling capacity and fuel efficiency, right? Well, the designers and engineers at GMC don’t think that...