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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 8.5-8.8. Needless to say I feel like this is extrextremly slow. Has anyone else had this problem or knof possible solutions?
 

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At 150K miles you are going to start having things wear down. Rings will get looser, bearings will start to wear, etc. That is going to cause numbers to decrease. The best approach is going to be to make sure the car is running in peak form. Do a full tune up making sure all fluids, etc are in top form. You also have to keep in mind the published numbers are going to be ideal situation with expert driver, etc.
 
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