I just replace my ecu chip and alternator. The car doesn't rev down very quickly and sometime not at all. The throttle cable isn't stuck nor is the pedal. It never did this with the last chip. Also the Check engine light flashes when accelerating using more than 1/2 throttle. I can't get the codes since the light isn't on all the time. I have searched the forum and fould nothing. I just swapped engines from a 3.0 to a 4.0 v8 and I put a 4.0 chip in the ecu. Any help would be deeply appreciated. I am out of ideas.