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2004 GTP massive hesitation

YeahRight

New member
Well, I started the car to go home from work and it idles fine & smooth. Put it in gear to back out of parking space and massive hesitation starts when I touch the throttle. Literally like half throttle to zero and back alternation about once a second. Tach bounces up & down from zero to 3500. If I hold the throttle about half it will eventually clear itself up to accelerate. My thoughts are either the throttle or throttle body. Or the crank sensor since the tach freaks out. No check engine lights. Starts & idles fine. I know the throttle is opening at least because I could hear the supercharger whine more with it full throttle even when the engine is essentially off during the surging hesitation problem. Any other ideas? Thanks!
 


And apparently it's sporadic. I just went out to switch cars around to drive something else tomorrow and it started & ran normally. Took it for a test drive of a couple miles, all normal. Sigh.
 
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