Questions & Answers for: Geo Prizm rough running

Ruff idle(new plugs installed) runs great Had exhaust leak fixed rough idling can be caused by dirty air filter.dirty throttle valve and bore.vacuum leak at egr valve and pvc valve.also idling too low

running rough,doing bad on gas mileage..already replaced spark plugs,. spark plug wires.rotor, distributor cap. replaced the fuel filter a thousand miles ago. .. Check your timing with a timing light.

...belt broke. Checked Compression all cyls OK. 130-150 PSI Now, engine barely turns over runs very rough. Can be run for minutes, rough by careful thottle. maybe 400 rpm after start. Very little RPM ...

...It is hard to start when cold or has been sitting for a few hours. When it does start it runs rough for a few minutes then is fine and runs great. if it contines to run fine dont mess with ...

...rough at a stop when given gas it would move very slowly then suddenly catch and lurch forward or die completely. First check for spark at any of the sparkplugs.If you have spark then it is more ...

Engine runs rough Washed the engine now the engine runs rough wont stay on . Replaced cap , rotor , & coil still runs rough . unplug ur main wires an make sure there dry

engine idlols fine in park, but chokes down and runs rough in gear. engine idols fine in park and in neutral, but when you come to a stop the engine will not idol in gear, it begins to run very rough ...

...running rough during the cold spell.Put it on a scope and the only thing that was out of specs was the map sensor new spark wires. old wires hate, cold damp weather. spark plugs, cap,rotor wires, try ...

...indicate? Smooth idle unless a/c is running or load applied. Then it runs rough almost like timing is out. Hi Martin,here's a link to your code. P0431 Warm Up Catalyst Efficiency Below Threshold Bank ...

...is an 02 senor ahead of the cat or muffler take it out and see if the car will start, it will run rough but if it starts one of them is plugged and it most likely is the catalytic converter in the ...