[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