Maybe my luck has finally changed, but since I started driving in the 90s Ive had several GMs... F bodies, Cutlasses, trucks, vans, etc. Every single one that I can remember had a cracked dash except my 2007 Silverado LTZ.
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I had random misfires and my radio would reboot when a misfire occurred at high rpm. Wound up being ground problems. I would clean up all your grounds 1st and even add a few more. Worked wonders for my 98 K1500.