Before installing the obd1 ecu, the car idled and drove fine. After installing the obd1 ecu, the car will idle between 500 and 1k rpms, and sometimes shuts right off within 15-20 seconds. 500 for about 3-4 seconds, then to 1k for about 3-4 seconds. I'm thinking it could be the IACV, because I did the 2-wire mod to run the obd2 ecu. Any input would be greatly appreciated.

Setup is as followes
96 Civic
GSR, stock w/ head gasket
Edelbrock manifold
OBD2 harness, with ckf sensor mod
SC61
rc550
Phearable ecu
Missing link - removed
255 wally

 

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John Vega - Phearable.net