What did you do to make it a 2.5/4? Is it a modded belltech kit? It is prefect! I am looking at the 2/3-4 kit for my 08 Denali, but thought I would ask first.
Did not read the whole thread but a few pages. This is a very common problem. Best diagnosis in my opinion is performing a voltage drop on all battery cables while cranking. Remove the injector fuses before performing the voltage drop test. Anything over 200mV or .2 volts replace that cable. I...
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