7 Shops Later...Biggest Parts Cannon FAIL of 2021!! (Chevy Truck Misfires - Part 1)

Where do we begin? This poor 2001 GMC Sierra V8 has been running like dog poo for over a year. Shop owner says that under load Bank 1 cylinders start misfiring and dropping out to the point where the truck is barely drivable! It has been to 7 SHOPS, and each shop has apparently replaced some parts and sent the customer down the road... the last guy told the customer that it "needs a wiring harness" xD Apparently it is UNFIXABLE! Let s start the diagnosis from scratch and see how badly the Parts Cannon FAILED on this truck... THINKTOOL PROS: https://www.amazon.com/dp/B08SWH2KP4?ref=exp_pinehollowautodiagnostics_dp_vv_d Happy New Year! Ivan