89 F150 302 4x4 has been having idle issues. Finally, I replaced ECM and able to pull codes. I got code 33 (EGR valve does not open).

Installed new EGR sensor and now when I shift into PARK the engine stalls.

I pulled codes again and I got 11 on both KOEO and Cont.

 

Maybe the IAC? I'd give it a clean and see if it does the same thing.. I've read before on here guys having that same issue

 

Yeah, IAC is brand new, so as TPS.