pederl Posted January 3, 2011 Share Posted January 3, 2011 My 1989 4.0L Comanche runs REALLY rough, if I bypass the MAP sensor it runs better, I tried a new on and it does the same thing, If the MAP sensor is good, why does it run like crap when it is connected, any ideas??? Thank you. Link to comment Share on other sites More sharing options...
MJRemi Posted January 5, 2011 Share Posted January 5, 2011 Have you checked the electrical wires that run to the MAP. Perhaps there is a bad connection causing the sensor to misread. Link to comment Share on other sites More sharing options...
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