I run 18psi and @ 5000rpm in 3rd gear it spikes to 25psi before I can let out of it. The truck shifts @ 5900rpm, I have no problems in 1st and 2nd gear. I have checked the exhaust there is nothing blocking it I dont have cats and the mufflers look in ok. the first time it happened it burned a plug. Anyone have some input?:shrug:
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