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So how did it go?

Go to gmpartsdirect.com and look up the car and search around in emissions I think. They have exploded views of most parts. Saved me multiple times.

Oh and I definitely know about not using the...

I would start with the most simple options. #1 what spark plugs were in it when you bought it and which ones did you replace them with? If they were anything but generic copper plugs, that may...