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try disconnecting wire to the throttle switch. the one at closed throttle not wot. Fuel cut out/in was never smooth on mine. Finally used a a different ecu that cut back in at higher rpm. maybe 3000 vs 1800? it's been a while...... It probably used more fuel, but was worth it.

FYI, the 79 harnesss probably won't have the pin for the o2 sensor. You can unplug the harness, solder a small wire to the pin on the ecu and run it thru the hole in the plug to connect to an O2. Gently guide the wire thru the plug while plugging back up to the ecu. Don't remember the pin #, but it ...