
What does this thing actually do, why does the ECM need to know the pressure for the EVAP system? I keep getting codes related to it, can it hinder MPG at all, I am having a hard time finding info on this damn thing.
99 K1500 Suburban LT "THE BEAST"
5.7 K&N & True Dual Exhaust
Hypertech III
05 17" Silverado rims
99 LS 1500 5.3 "THE MULE"
Reg Cab Long Box
285/75/16E Dunlop Rover M/T
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Jason
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