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09-08-2017
When my 2004 grand prix gtp is cold, it runs fine, and has original power. When its warmed up, and I romp on it, it makes a grinding noise, and their is no power at all, if i continue to hold down on the accelerator, the check engine light flashes and sometimes stay on. Anyone know if this is the supercharger or anything else?
09-08-2017
you need a tune up real bad, or the cat is clogged up.
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