Hello group,

1991 Astro 4.3L(vin Z), A/T, PROM broadcast code=AMUH.

ECM is actuating EGR solenoid when TPS voltage goes above 0.70 volts. TPS is non-adjustable and at closed throttle it reads 0.68 volts (spec. 0.4-1.25 according to MOD). As you can imagine... Login to read more.