1992 sc400 has intermediate idle drop that isnt constant and no power in gear

went through and put a screw driver on all the injectors, they all sound fine, all the cylinders seem to be functioning so not a coil, plug wire, plugs or distributor and or rotor, may be the tps, i already pulled and cleaned the iacv and egr, new fuel filter, new pump, 12v mod, switched relays with the dimmer and its still doing it, switched to a fresh fuel pump fuse, maf doesnt seem to be affecting anything, possibly antitheft ecu prob, ign switch

 

Have you checked the ECU yet for capacitor leakage?

 

Ecu was rebuilt recently

 

Welcome to the club. Buy a new MAF sensor and see if that works. Im dealing with the same issue.