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  1. DTC's, Problems & Troubleshooting
    I have a 2007 Grand Prix GT, and I have had issues with a rattling spark knock type sound when accelerating while the engine is cold for quite some time. When I purchased the car in 2015, it had a bad spark knock problem to the point I ran premium grade fuel. Not long after purchase, I replaced...
    acceleration coldstart fuel grandprix sparkknock
  2. General Tech
    Hello, I'm new to the forum but perhaps you guys can help me out. I drive a 1998 Pontiac Grand Prix GTP with ~150,000 on it. I took it out today to run a couple 0-60 just to compare to what it said it could do when it was new. When I ran it I expected high 6s low 7s and ended up clocked at...
    0-60 acceleration slow sluggish take off
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