Thread: Gen 3 5.3L has a MISFIRE only at IDLE and only fully WARM... ?!
hptuners.com
Thread: Gen 3 5.3L has a MISFIRE only at IDLE and only fully WARM... ?!
Hello, I've had a 5.3 swap in the car now for over a year, 10k miles almost. It runs and drives perfect. Not even a slight hiccup while driving. It also runs idles fine when cold. However, once it gets hot, it will misfire at idle. ONLY idle. If I raise the rpm above 1k slightly the miss is almost gone, and if I drive it at all there is never ...
Apr 7, 2018
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