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 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?
Motor is idling rough.
I would recommend checking for codes before you do anything else.
Rough idling and hesitation can be caused by several different things. The most common causes are; bad spark plugs, bad spark plug wires, and a dirty air filter.
My 1986 Honda Accord Dx just started idling rough and dieing at turns and stops it is a carburated 2.0 witha maunal transmission
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
a longer cam shaft will make a car idle rough