Engine Mechanical problem
1999 Chevy Tahoe V8 Four Wheel Drive Automatic 167000 miles
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I have a 99 Tahoe with 167000 miles on it. The truck has been parked and not turned on for about two months. I chared the battery and started it up after checking all fluid levels wich are all good and the truck had a recent oil change. the truck was driving nice and strong and engine sounded good untill we reved the engine a little bit to blow out because it has been sitting with out being ran for a month or two, after reving the motor up for about 30 to 40 seconds the truck started to knock and when you drive it it runs strong but knocks like crazy. loudest form valve cover area and from under the truck neer oil pan what can this be am I going to need a rebuild? also hooked to computer and it said miss fire frome cylender 5 this was before the knocking and reving of the engin???