check the contiuity of the throttle position sensor, should have cont when fully closed. its the bottom 2 of the 4 terminals to check. if no cont then loosen the screws and adjust it to where there is continuity. i dont know why but i have had to do this twice to my car. impossable to time it unless the tps is closed. and it idles rough and will die sometimes if i let off gas to fast. try vac lines first of course.
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