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.
The oil could be old and needing change. The oil filter could be getting stopped up, or the screen on the oil pump could be clogged. An oil change and new filter is the first place to start.
the problem could be that the enegn is jamed
My 98 riviera was doing the same I put some stp complete fuel system cleaner and it stopped happening might be worth a try it was only $9
My dashpanel lights stopped working in your Chevy Monte Carlo ss 2001 what could the problem be
The fuel filter could be clogged. Or the air filter could be stopped up, or the choke could be stuck. these would be the first things to check.
Several things could cause this problem. The fuel filter could be stopped up, or a fuel, injector could be clogged or nor operating properly. Reading the computer code should show if there is another problem with the engine.
It could be as simple as a stopped up fuel filter.
could be clogged fuel injectors or a fuel filter.
it could be a stopped up air filter
fuel filter
There could be a ground on the body of the vehicle. If this isn't the case there could also be a problem with the relay that go to the indicators.
It is a problem. If the fans don't work, the engine will overheat when you are in slow or stopped traffic. This could simply be a fuse (check under the bonnet beside the battery for the fuse box - they should be clearly labelled). It could be the coolant teperature sensor or a fault on the engine management unit. Check with a mechanic for a proper diagnosis.