Not sure about the cats. How do you check them? What happens if they are clogged? Ran great about 3 weeks. Fuel pump is good, no vac leaks. Don't remember the brand of COP but got them from Advance Auto Parts. I don't have a scanner and I have disconnected the battery.
Was having trouble with MAF and coils. Replaced, ran great. Then all of a sudden, car started making a lot of noise under neath, backfiring really bad and won't run good enough to back out of the driveway. No check engine light!! I'm stuck. Any ideas?? Could really use some help.
Thanks.
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