Question about 1991 Plymouth Laser

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Engine runs rough after about ten minutes /idles really low

91 Plymouth Laser RS, engine starts fine, car runs great until after about ten miles/ten minutes idle is bad/low check engine light comes on. If accelerating its fine, if the you come to a stop it idels bad, you press the gas pedel rpms come up and it turns off the light. Runs great as long as you are accelerating but once you get up to speed (even on highway) and take foot of the gas pedal, check engine light comes back on and it starts cutting out/rough. Timing checked, replaced manifold o2 sensor....same problem

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  • Anonymous Mar 17, 2014

    my problem is not the check engine light it is the check gauges light the vehicle stops when i stop for a traffic light and idlles for a short time after 20 minutes of rest then it will start and run smooth

  • Anonymous Mar 17, 2014

    my problem is not the check engine light it is the check gauges light the vehicle stops when i stop for a traffic light and idlles for a short time after 20 minutes of rest then it will start and run smooth

  • Anonymous Mar 26, 2014

    Mi mercury cougar has an a acelaration problem even if you're not steping on the gas it goes from 0 to 45 en a few seconds when the car is idle whe you turn it off smoke comes out from the engine

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Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.

Posted on Jan 17, 2009

  • johnny rebel
    johnny rebel Jul 13, 2014

    OXYGEN SENSOR IS BAD,OR,SOMETHING IS GETTING HOT,LIKE SOLENOID,STARTER,PLUG WIRES,OR A SENSOR.

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