I'm having trouble narrowing down the root cause of this studder. Crusing at 50+ mph and start going up a hill the engine starts to lug and timing drops to around 5* and bounces to zero and back to 5 ish. I can't for the life of me find whats pulling the timing.
17 Silverado. Low rpm(1100-1500), high load (.60cyl air+) studder.
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NEW!!!
I will make one calibration change for an additional $100 per change. For example, changing a shift point for a given gear is $100 vs changing a shift point and a pressure setting would be $200. That value can be used towards the full custom tuning price.
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