So it took me longer to get around to it than expected but the misfire did not follow the coils. I ordered a new crank sensor and got access to a high end scan tool, so if I have time before the weather turns cold I'll change out the sensor and do the relearn. Hopefully this is the fix. I'll try to post my results.
I had thought about swapping coils around but then I thought it would be very strange if 4 coils failed at the same exact time. Still something I can do, I just thought it'd be unlikely for them all to fail concurrently and at such a low mileage. I'll likely get around to swapping them this weekend and will try to report back with any findings (nowhere really close I can get up to 75mph so won't be able to do it until the weekend).
Have a 2006 Silverado 2500HD 6.0 with ~49,000 miles. Runs great until I hit ~70mph, and then it throws a P0300 random misfire code. It doesn't seem to bog the engine down (doesn't stutter/hesitate or anything). Pulled out my code reader to read live data and it's misfiring on cylinders 1, 5, 6, & 8. Replaced all spark plugs and wires and the problem persists. I find it hard to believe I'd have 4 coils go bad at once so I kind of ruled those out. From research, it seems a lot of people have had multiple random cylinder misfires like this on the 6.0s and seems like everyone had a different solution ranging from cats to O2s to crankshaft position sensor etc. Was wondering if anyone had some guidance on how I can pinpoint the issue without throwing money at parts or taking it to a shop. Engine light flashes a P0300 once I hit 70 mph and occasionally stays on for a P0300 (one is pending and one is current). Also just threw an evap system code for the first time (P0446), not sure if related.
Thanks everyone for the feedback. I may try using a strap wrench so I don't have to replace it right away. I'd be somewhat surprised if the bulbs are burnt out because the truck only has 48,000 miles. Maybe I'll touch up the solder joints. Thought if they weren't soldered I'd just replaced them with colored LEDs. They looked pretty awesome on my old Chevy but took more time than I liked.
I have a 2006 Silverado 2500HD 6.0 that I just picked up a couple days ago. It has a squealing belt and when I went to change it out, the bolt on the belt tensioner just spins (doesn't actually relieve tension on the belt). Is this a sign that the tensioner has failed? Or am I just missing something? Also, the light behind the speedometer on the cluster is burnt out. I've replaced the bulbs on another Chevy I owned and they had to be soldered in, but from looking online I found some models have twist in light bulbs. Does anyone have experience replacing the bulbs on the 2006 model? I'd rather not go through the effort of soldering again since I'd have to remove the gauge needles and it was difficult to calibrate them once reassembled.
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