Question about 2005 Pontiac Grand Prix Base

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My 2005 Grand Prix has no acceleration power/torque...

-To preface the issue; there was an existing issue with the exhaust, somewhere between the back seat and drivers seat. Yesterday, on my way home from the bank, my car seemed to "sputter" when I would press on the gas pedal. There was already a lack of power due to the exhaust leak, however this time seemed much more severe. As I approached the Highway entrance ramp, I released my foot from the gas pedal. When I pressed back down to accelerate, the engine rev'ed as if it was in neutral. Simultaneously, the heater blower was shutting off and turning back on. I pulled over and shut the car off. 30 seconds later it started right back up and went back in gear. There was still a tremendous lack of power, however I was able to make it home. Any idea what the issues are?

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Posted on Jan 02, 2017

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SOURCE: 2001 Grand Prix GT 3800 series engine

The best solution is to do a complete tune up with new spark plugs, wires, fuel filter, air filter, pcv valve and oil change.. If this still happen I would get some fuel injector cleaner, or use marvel mystery oil in both your oil(crankcase) and gas tank. You can get mystery oil at walmart..its in a red bottle with black label.

Posted on Jan 18, 2009

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SOURCE: 1988 pontiac grand prix less power

2.8l were known for fuel injectors, vacuum leaks up by the throttle body, and there is also the idle speed control, but sounds like injectors or vacuum, double check your wires on the coils too

Posted on Jul 23, 2010

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