Why does car have rough idle it overheated what could be the problem?
If you suspect overheat has caused a problem, you first need to run a compression test. That way you can eliminate some of the problems that are often caused when an engine is overheated. As you're pulling the plugs for the compression test, make sure the plug colors are even, and light to medium grey. Any dark or damaged plugs can indicate other problems. If the compression test indicates that all cylinders have good, even compression and you just have a dark plug, you may have dodged the big expense. Good luck.
Why does your 91 Toyota Celica idle rough at times and accelerate very rough at low revs before smoothing out at high revs?
Can anyone tell you why your 1986 Chevy Celebrity has a rough idle when stopped in drive but OK in neutral?
What is wrong with a 90 LeSabre Custom 3.8L if it idles rough and stalls when going from park to drive after it overheated?
Why does your 2000 Pontiac Grand Am run rough at idle while in gear but runs smoothly if placed in neutral?
Yes it could. Why not replace it? It's cheap and most people never do until they stall some dark lonely night. It depends on what kind of car and what engine you have. Go ahead and replace the fuel filter although I don't think it will cure the rough idle. If you have a carburetor, it may need cleaning or adjusting. If you have fuel injection, try some injector cleaner in the tank.