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If you have a code reader, you can retrieve the codes. It's possible that the MAP (Manifold Absolute Pressure) sensor could be faulty, thereby sending no signal/wrong signal to the computer. Most repair shops will charge about $100.00 to diagnose (hook up to their computer for code retrieval), then deduct this charge for repair of the problem.

Some codes are "hard", meaning that they will cause the Check Engine light to come on. Other codes are "soft", meaning that they will not cause the Check Engine light to come on, but the problem still exists.

Make sure you clear all codes if you retrieve them yourself. If you don't know how to do this properly, just disconnect the cables from the battery and wait for about 1/2 hour, then re-connect.

Another idea may be to have the timing checked.

I just changed my MAP sensor after retrieving the code with my reader. The MAP sensor cost me about $79.00 at NAPA Auto Parts, and about an hour total time (diagnose and repair).

Hope this wasn't too thorough.

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Q: 91 ford aerostar 3.00 engine AT emission problems run rough?
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