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Answered 2011-09-13 17:51:37

Im not sure, but my 2001 Galant 2.4 GDI is doing the same thing. At first it wouldn't start. I cleaned the throttle body (severe tarry coke buildup) and replaced the high preasure fuel pump. Now it will start but revs up and down, and when the throttle is pressed fully wont rev higher than 3000 rpm. Sounds as though its hitting the rev limiter but alot lower......

Im going to replace the throttle body and MAF sensor next. Im also going to check the EGR valve incase it is stuck open. I will probably bypass the EGR valve altogether.

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