Question about 1986 Ford Mustang

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86 mustang 5.0 fuel injected. At cold, starts great and runs stong and firm. After driving about 10-15 mins it starts sputtering and wants to lope and die at idle. Driving, it hardly idles at a stop and sputters from a stop until I punch it. Then, it takes offlike a bat outta hell. Ideas what's wrong?

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Your fuel air mixture is wrong. Just like a choke. When it is cold it dumps more fuel in, when it warms up it is supposed to mix in more air. It does not seem to be doing this. You need to have that adjusted. In the meantime you can adjust you idle a little higher. You can do this by adjust a screw where the throttle cable sits on top of the engine.... Please give a good rating, it reaaly means a lot. Please feel free to keep in touch

Posted on Aug 01, 2009

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Check for a vacuum leak at the intake gaskets or throtle body. Once they heat up they shrink and can cause a leak. Good luck.

Posted on Aug 01, 2009

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