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Take your vehicle to your local autozone if you have one, or some other autoparts store that can see what check engine light code is coming up on your truck. I am sure there is one, as you describe a problem with you idle which is computer controlled. Could be any number of reasons, ie Throttle Position Sensor(tps), vacuum leak, Egr valve problem, an a numerous other things I could continue to list. If no one in your area has a way to check your car for free, take it to a reputable shop and ask for engine diagnosis with an estimate. Usually they charge a rate for checking the problem and give an estimate, and if you let them repair the vehicle, there is no charge for the diagnosis.

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Q: Why the idle speed does not stay on my Mazda B2200 1987?
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