I love my car but, I'm old school and sometimes I'd like to take all this computer engine control crap and trash it! My car is running really rough. I got the trouble code from the computer P0506 which means "Idle Air Control (IAC) system, rpm lower than expected". I've worked with Idle Air Control valves before so I figured it wasn't to bad. Until I looked under the hood and didn't see anything that looked like an IAC, so I looked in the service manual and found out that there is no actual IAC valve it's part of the "Powertrain Control Module" Sooooo...Now what do I do. I really hope I don't have to buy a new modual because I'm pretty sure that a simple IAC would be a LOT cheaper. Can some one please help?