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IIRC the '92+22re's fuel injectors have a different impedance and wont work with the pre '92 ecu's. This isn't a real issue, just swap over the the '94 engine(block and head), but use all of the '91's electronics.

IIRC it was 89-90 they did the switch over for injectors (as well as the intake).

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim