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need help

replay40

New member
i have never posted on this forum before but have gotten alot of useful information. first i have a 2001 grand prix 3800 naturally aspired motor that is having problems starting. this has gradually gotten worse and does not happen all the time and happens when cold or hot. there is no codes when read with the scanner. when starting the motor will either not want to turn on or will bog down for a period of time before idling correctly. when i mean bog down i mean misfire and jump around quite a bit. once on though the car runs great, no problems. things changed: spark plugs, wires, all coils, mass air flow sensor, ignition control module. any help would be greatly appreciated.
 


thanks for the replies. today i used a fuel pressure tester and idle psi was 25. replaced the fuel pump and now it runs beautifully.
 
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