Clogged fuel filter Failing fuel pump Dirty plugs Failing plug wires Dirty Air Filter
plugged catalytic converter
Morgan
If you know the spark plugs and wires are good, then check for a vacuum leak. The vehicle is 11 years old, and you may very well have a crack in a vacuum hose. A leaking intake manifold gasket will also cause rough idle.
I have a 2004 gt that has also developed a rough idle also and can't find the problem.... I wish you had the answer....
You might try checking you idle air control valve.
my 1990 300zx is idling rough what could cause this?
Generally rough idle ; once you accelerate the problem goes away. I hope this helps you. Mark
Why does my 2001 kia sportage idle rough?
rough idle smell gas
why does my vr commodore idle rough when at complete stop
The idle could be a number of things. A basic tune up might be needed. They are also common to get minor vacuum leaks that will cause it to idle rough. The only light is a bad thing. It means you do not have enough oil in your motor. So when you are stoppong it is sloshing away from then sensor and you accelerate it gets back to it. Check your oil level and add oil or I would replace it because it probably over due anyway.