i have an 02 lb7 i am running no lift pump and about a 150 efi tune Lately my fuel mileage has been dropping and ive been getting greyish smoke. I used to be able to hold 18000 psi or so rail pressure under full throttle now with the tune it will fade to 8000
I put a new fuel filter on didnt help much. I tried the stock tune and it would only hold about 11000. If i command it to 23000 at idle it will only go to 15000. I have a lope at idle and i didnt know if replacing the fuel rail pressure regulator would help it hold more pressure or not. the lope will go away when i run 2 stroke oil. Or do i need a new cp3
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