Thread: Running Rough (cold / idle)

Need a little help on where to start with my rough running 2005 grand prix N/A. It just began running rough when cold and at idle when hot. It still runs strong and no problems when moving from what I can tell.

It has 163,000 miles on it. I changed out the plugs and wires at 110,000. Did the LIM around 125,000 with a nice throttle body clean.

Any guidance on where to start would help! Thanks.

Depending on the plugs you bought, they might need to be replaced again.

Try cleaning your MAF sensor and throttle body aswell.