It's a heads and cam 5.3 basically. The main problem is it won't idle. Idle is set at 550 and that's just to low for the cam. TSP 228R. The fans are set to come on way to high and I don't like the way the TCC locks up to early in 4th. I'm afraid to even get on it really because I'm afraid of the tune. I ordered hp tuners last night. Sux i have this truck I can't drive till it gets here though.



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