iac = isc

In a 92 sohc 12v 3.0, use page 13A-30 of the 92-95fsm, in the engine section, and connect a voltmeter/test light as shown to read the codes. 21 is the ect sensor code. You get a series of voltage pulses, read per the earlier pages of section 13a.

If I remember correctly, you set the basic throttle plate opening (the idle stop screw) using a drill bit, and then use the feeler gauge to set the tps. This is from the 89 manual, and I haven't looked in the 92-95 manual to see if the same procedure is used, but the engines are almost the same.

Not responsible for advice not taken...