So, I finally chased down most of my issues since doing the cam & headers. Tonight I fixed my code 172 (new fuel filter did it), and the idle went up even more (from ~1300 to ~1600). I plan on checking the TPS output again tomorrow, but the computer supposedly zeros at key-on. Tomorrow I will also pull the plug on the IAC and check the adjustment screw. Anyone have any other ideas to run down?
Thanks in advance,

-Mike

 

What is the engine RPM when you have the IAC plug disconnected? Should be around 675 - 725. Either way, it should drop considerably when you disconnect it. What's your timing set at? Remember elevated timing will also increase idle RPM.

 

is the idle supposed to drop way down or does that mean the thing it plugs into is bad the truck runs good without it plugged in what should i do

 

If the Idle stayed high, either:
1) the IAC is stuck
2) throttle blades are improperly adjusted
3) you have a vacuum leak

The engine *should* die with the IAC unplugged if everything is set up properly.

My issue is (still) a vacuum leak.

-Mike