Could be crankshaft position sensor, if the tach from it quits it will kill the engine. My 02 Tahoe would just go dead, tech at gm dealer just happen spot it drop out just before going dead.
I have 145 k on my 2007 Yukon Denali 6.2. My pressure when hot was dropping to around 25 psi, I changed to 5wx40 FS and have noticed about a 10 psi increase when hot to just under 40. I’m going to add ATP AT-205 that I saw on you tube by Kilmer to see if it can soften than oring up and maybe...
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