Question about 1999 Pontiac Grand Prix

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I have a 99 grand prix gtp supercharged 3.8 series 2 motor it starts right up runs fine at idle for 2 minutes then shuts down if i feather the throttle and keep it reving it stays running but when i let off the throttle it wont catch itself and shuts down any answers to my problem?

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It is your.maf sensor bad

Posted on Jan 26, 2012

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Check your fuel filters, fuel line, and fuel pump

Posted on May 13, 2010

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1 Answer

Will the motor and tranny from a 1998 pontiac grand prix GT 2 door coupe 3.8L motor fit in a 1998 pontiac grand prix GTP supercharged 3.8l motor


everything will cross over but the engine and transmission in the gtp are suppose be heavier duty built

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Transmission Compatibility


As you see I provided you the models you can apply the transmission :The 4T65E-HD (code MN7) is a heavy duty version of the 4T65-E used with more powerful engines such as the LS4 V8 and L67/L32 supercharged V6. Applications: 2.93:1 MN7 Pontiac Bonneville SSEi L67 Chevrolet Impala L67 Chevrolet Monte Carlo L67 Pontiac Grand Prix GTP/GXP Buick Regal GS Buick Riviera L67 (97-99) So ,yes you can!

May 28, 2013 | 1998 Pontiac Grand Prix

1 Answer

1999 grand prix gtp supercharged thats starts up and runs for a few seconds then shuts down.


When you say it shuts down do you mean "dies"? If so try checking your fuel pressure regulator.

May 09, 2010 | 1999 Pontiac Grand Prix

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2000 Grand Prix GTP supercharger fluctuates when accelerating


There is no wastegate.

Change the spark plugs and pay special attention to the plug on bank 3. Look for physical damage on the electrode...cracked, bent etc.
Use Autolite 605's copper core gapped to .055" and NEVER run less than 92 octane.

Apr 02, 2010 | 2000 Pontiac Grand Prix

1 Answer

Pontiac turn of in low rpm


that would be your o2 sensor most likely. make sure its plugged in properly and that its not bad.

Mar 01, 2010 | 1999 Pontiac Grand Prix

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My 2000 Grand Prix GTP Supercharged was running fine but it shut off with a "check guages" warning. The gusges were fine and the car will start but it shuts off right away. The engine will stay running if...


check fuel pump resister. its conector is by the batt. pump runs through it in run, not for 3 sec. when key is turned on. thats why it will start and then quit this happend to my 99 gtp

Jun 09, 2009 | 1999 Pontiac Grand Prix

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