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I switched out the stock plugs during a tune up in June 2012 with AC Delco 41-110 Iridium plugs per the AC Delco book and Rock Auto lookup. Since the tune up, I've always felt the gas mileage has come down. I'm getting 14-15 MPG on the highway keeping it under 70 MPH, when I used to get...

I picked up a 2000 Tahoe 5.3L with 60K miles. Only problem is a heavy ping on acceleration and mild ping at cruising speeds. No ping below 1500 RPM. I orginally thought it was carbon knock since the lady that owned it did not drive it much and I'm sure she did not put her foot in it to keep...