The car has not been started after a while due to a wreck. But when I removed all the damaged radiator parts in the front I got the car started. I had to replace the crankshaft sensor because it was broken from impact. When the car starts it gradually revs up and the randomly dips down to low rpms and revs up again. Basically car does not idle at a stable rpms. What could be the problem for this?

 

sounds like a vacuum leak..

 

Any ways or ideas on how to fix a vacuum leak?

 

Is this the same flood damaged car you were asking about rust issues in another thread?

Also, please post your threads in the appropriate place. The forum question and suggestion forum is not what you seem to think it is. Read what each forum is for and place your threads in the appropriate one so that people who might be able to help you sill actually see it.

And good luck with your car.

 

Thinking vacumn leak as well, mine did the same thing, never fixed if but for a vacumn leak you have to check if there's any holes in your air intake or something like that there must be a leak somewhere. Let me show you a video of my 08 coupe when it used to do that, I now have a sedan but this was my prior car

 

Yes this looks like what mine is doing but mine goes up higher in the Rpms. Also when gassing it alittle it would choke and not rev like it should

 

Throttle bodies ever been cleaned?

 

^^^+1, then vacuum leak.

 

I will look into it and clean them. I'll let you guys know what happens

 

Try the throttle body relearn procedure while your at it.

 

also, if you did clean them and it still occurs, check for vacuum leaks and then replace your throttle bodies. I tried cleaning them but replacing them finally stopped the idling issue