I would suggest a new set of plug wires.
Check your coil packs, my Corsica goes thru them like water. Would not hurt to check your fuel pressure. Online tech manual at Alldata.com can really help out if your interested.
If you have replaced plugs and wire most likely one of your coil pack usually run about $50
Rough idling on a 2001 Chevy Metro after a timing belt change could be caused by improper timing adjustments, leading to a misalignment of the engine's timing. Additionally, issues such as vacuum leaks, faulty spark plugs, or incorrect fuel mixture can contribute to rough idling. It's also possible that sensors like the mass airflow sensor or throttle position sensor were disturbed during the repair, affecting engine performance. Checking these components and ensuring proper installation can help resolve the issue.
Rough idling is whenever the vehicle's motor "misses" or does not fire causing an imbalance and a loss of rotation reducing the motor's power and causing excessive shaking.
Rough Riders of Cheyenne - 1945 is rated/received certificates of: USA:Approved (PCA #11146)
my 1990 300zx is idling rough what could cause this?
I would recommend checking for codes before you do anything else.
Motor is idling rough.
if it is a vortec, there is a fuel line under the upper intake that goes from the manifold to the injector. check it for cracks and leaking or the injector itself. EGR Valve
timing off
I would suspect the idle speed motor is faulty. Does the motor sometimes idle fine and then other times rough? They are about $100.00 last time I had priced one. Your dealer can price one and print out a picture of it and where it is located so you can recognize it.....1930fcoupe
My 1986 Honda Accord Dx just started idling rough and dieing at turns and stops it is a carburated 2.0 witha maunal transmission