I’m working on an ’88 escort and it won’t stay running...

Does any one know how to test the ICM or the TPS on this vehicle?
Has anyone had a similar problem and know what repaired the problem?

Details:
’88 escort 1.9L TBI (CFI) 9 engine code.

Symptom:
Car won’t idle, needs to control idle manually.
Doesn’t matter if it’s warm or cold, in our out of gear...

Notes:
I feel it’s either the Idle control motor (ICM) or the throttle position sensor (TPS). However these items are $50 - $100 each which is around 2-3 times the cars value...

Take that ICM off and lubricate it. Got a 97 that has an IAC (idle air control) and it would idle really rough. Lubed it and was OK. I think the ICM is the same thing on the older scorts.