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Eratic idle
My 2000 5.7l k3500 has an idle issue. It starts and runs fine until the engine is warm. Then the idle is eratic. It seems worse when the truck is in gear. I shift to neutral and it seems to smooth right out. The problem seems to be magnified in reverse. I can hardly keep the thing running while backing up. So far no codes. I have cleaned out the IAC passages and no difference. I tried to clean the the TB with the proper cleaner but the truck will not run with the air box off. Should i take it in and get the fuel system cleaned? Any help on this problem will be greatly appreciated.
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