JackandJanet, I have cleaned the intake system extensively and hasn't had an impact. When I say it "misfires" it simply "skips" like an older carbureted engine. No bucking involved. When I give more gas to the engine it clears out. Im thinking its all in the programmer since it doesn't do it when the programmer is set to transmission only mode. While we are on the topic, what is the difference between flex fuel 5.4 and normal 5.4? Other than injectors and tune.
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