85 Dodge Aries, Intermittent High Idle

So I have an 85 Dodge Aries with a 2.2l engine. It’s apparently one of the few with the TBI fuel system. I do have an alldatadiy account for the 86 model(closest year that had efi listed as an option).
The problem starts after driving for 10 minutes roughly, and will persist through several days (many trips to work, so several cold start- full temp cycles), and go out to start it and the idle is back to normal for a few days, then it’s back to screaming idle.

I did clean out a connector that goes to the Automatic Idle speed circuit and throttle position sensor, was all gunked up and green. Idle was still racing.
I did check the resistance of the IAC, and it ohmed out at 53.5ohm. I cannot find any diagnostics for the TPS, injector etc.
I did check the voltage of the TPS/ground connection and I got 4.9v at the connector (power and ground in the connector) although I do not know if that is correct.
The electrical diagrams I have are merely okay, as the connectors shown do not match what is actually on the vehicle. The wiring colors do show the same though.
When the car is warm it does have a detonation issue if given mild load. (possible stuck EGR?)

I just recently completed a headgasket and head change on this car, but the high idle was present before the headgasket went belly up. The head was changed to a later model year head for the roller cam set up instead of sliders.

Any help would be appreciated!