1995 Mitsubishi 3000GT SL Spyder, 1995 VR4, 1991 Stealth RT TT
I had a similar problem where my car would start and idle fine the after 20 seconds the RPM would drop (even with accelerator pushed) then stall out. I removed IAC and it failed the voltmeter test. That can damage ECU. So check your IAC and ECU.