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Originally Posted by bradslt5
man thats go to drive you nuts. the only thing i can think of other than the ecm would be a vaccume leak or i wonder if the fuel tank recirculation could cause this. one easy way to ck for vaccume leaks is to attach a 2-3ft hose to the end of a propane torch and just turn it on a little if you get an area that has a leak the motor speed will increase. on last thought you might ck around the plenum gaskets and throttle body. they might have a leak cold and it seals once things expand. dont know if this helps just thought to throw out some ideas . good luck hope you figure it out soon
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I have a vacuum leak detector, there are no leaks that I can find. Also, if it was a vacuum leak why would it go away once the engine was up to operating temperature? Anyway, if I get time this weekend I am going to try swapping out the ECM.