Your problem is you have a 95, with the OBD-II style 16-pin ALDL connector, and an OBD-I PCM. Are you buying OBD-I scanners, with the correct adapter plug, or are you trying to use an OBD-II scanner? OBD-I scanners don't need a power supply from the ALDL connector, so its not a fuse.
Courtesy of Shoebox:
Have you checked the O2 sensors?
Have you checked the coolant temp sensor reading?
The IAC is not a "sensor". Its an "actuator" - a small stepper motor with a pintle that opens and closes to regulate the amount of idle air. It gets a commend from the PCM on what position to take, and the PCM moves the pintle to hold the correct idle speed.
94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400+GearVendors OD/4.11's / Strange 12-bolt / 300-shot N2O / Spohn Suspension / 6-pt roll bar with integrated SFC's / full AutoMeter instrumentation / MoTeC M48 Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.