Hope someone can help!!! My 1999 Yukon has a bit of a rough idle. Not too bad, but noticeable. When it gets hot or its hot outside it surges sometimes. The injectors have been replaced last Oct to the MFI injector upgrade, plugs, wires, IAC, and PCV valve all have been changed. I checked for vacuum leak, nothing found. No check engine light either. I'm at a loss.
Would it be MAF? ERG Valve? Crankshaft pos sensor?
Would it be MAF? ERG Valve? Crankshaft pos sensor?
