shop msd is down, Cat Et not working , so I pulled codes via snapon scanner got 2 codes(63,164), on road test runs ok for awhile then engine lights comes on and vehicle derates with no acceleration till later picks up again, I'm having other tech inspect fuel regulator, and IAP sensor, performed pressure test, cylinder cutout test, seemed ok but I dont know the psi specs , any other ideas or things I should be inspecting for this concern with my limited resources !!
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