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Yessir, I plumbed one into the fuel line just for this reason! Had to verify

I've attached logs of these hard starting issues! One of them is cold, one is hot (based on ECT). One of them I continued to log through the 2nd attempt and firing in case it would help compare...

I have a 2000 Silverado that I?m having an intermittent hard start issue with. It?s got a built motor, which is a 5.3 bored 0.030 over, bigger cam, ported heads, higher compression, etc. When problem...