M20 cold idle troubleshoot

[sam3]

OK, I know this is common, but I'm just not too familiar with the M20s and it seems I've taken most of the immediate corrective actions already, (89 Ix) car has been a rough cold-idler for a while but has gotten worse lately.I changed out the blue coolant temp since this seemed like a likely candidate, the old one crumbled. Car has all new intake gaskets from some previous work, I swapped the ICV with a known good one, no change. New intake boot, nothing. Everything is plugged in, no check engine light, no intake leaks I can find. It's only when cold that the car stumbles, once warm it runs like a dream. What's next?
Thanks

[TurboJake]

Tried recalibrating the TPS?

[5KWattson]

Plugs wires try smoking the intake system see if that gets you anywhere I had a m20 cabi come in the other day poor idle was from rear seals @ valve cover

[jlevie]

Unless you know them to be less than 5 years old, replace the plugs, ignition wires, distributor cap, and rotor. Use NGK ZGR5A plugs only. Adjust the valves, check the rail fuel pressure, and have a shop run a smoke test on the intake can crankcase.

[sam3]

Solved

I decided to go through everything one more time, lo and behold I found that the center prong of the connector to the TPS had broken off, I soldered on a new plug and she fired instantly at -10 degrees, perfect 900 rpm idle. Gotta love 25 year-old cars.