Hi all, what could be causing these codes? They are the only codes I'm throwing, and I also have a high, unsteady idle. Truck stumbles sometimes under acceleration, and CEL only comes on intermittently for a short period, but always a few times per drive.
When I disconnect my Iac, idle doesn't drop. When I disconnect my MAF, engine dies. I can not detect any vacuum leaks via starter fluid or cigar method. Have already cleaned but not replaced MAF. Spark plugs look lean. Also replaced FPR, pressure was and is still a little on the low side at 28 psi. Also replaced my TPS and Camshaft position synchro, both of which I had codes for and only codes left are the 172,173,176,177. Anyone got ideas? Thank you