Recently picked up a 2002 GMC Sierra 4.8 auto because I needed a rear end. Fixed the rear drives good. My engine is now making a very loud noticeable whine coming from the back of engine driver side. (Belt is off) Checked vacuum and intake leaks with a smoke tester, nothing. Am also getting misfire codes for every cylinder on the driver side. Truck is very sluggish. I am very lost. Any help would be appreciated.
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