I have a 1993 GMC K1500 that had a few issues this morning. The trottle stuck open, then the power brakes went out, and then it started smoking from the throttle body (TBI). I work for Bridgestone/Firestone, so I dropped it off there, and the technician said it was the Idle Air Control Motor (no surprise) and a Transmission Pressure Switch. He didn't know anything about the switch, but he said he was able to unscrew the IAC with his fingers, and it's all broken up. I've been looking online for the part number for the IAC motor, but I can't find it for the life of me. Also, can anyone enlighten me on the Transmission Pressure Switch? The codes were 28 and 35, if that means much. It's the 350cu in/5.7L motor.

Thank god my Hemi is a little more reliable!

 

Just a little Help! lol

http://www.rockauto.com/catalog/rafr...;parttype=5028

This may not be the "manufacturer" part numbers but it is atleast a point in that direction...

In refrence to the Transmission Pressure Switch.... The Codes 28 and 35 mean... (From the OBDI Code Reader Manual Covers up to '95)

28 3rd gear switch
Quad-Driver module or Quad-driver No. 3 error
(Corvette)
(Transmission) Fluid pressure switch assembly - open or
short circuit problems

And

35 Idle air control (IAC) system problem - can not set
desired RPM or idle speed actuator (ISA) carbureted
system problems


Tranny Part:

http://www.rockauto.com/catalog/rafr...;parttype=4796

I hope this helps!