I put a turbo on my 4.3L, upgraded to a marine intake with 42 lb injectors and upgraded to a high flow fuel pump. I have flashed the injector calibration and tuned for the turbo by adjusting the power enrichment table.
I have it running fairly well except once the engine is warmed up and I am cruising at low RPM the engine will misfire. It will stop if I completely back off the throttle or open it up. I am wondering what I can monitor on the VCM Scanner to help me diagnose the cause of the misfire. My plugs, wires, coil and distributor are almost brand new along with the injectors so I don't think it is them but I want to be safe. Another thought I had was the cross over pipe for the exhaust manifold runs near the crank sensor so I am wondering if heat from exhaust is causing it to malfunction.
Or maybe I need to adjust other tables because of the addition of the turbo and that will fix it?
I am fairly new to tuning so any help/advice is greatly appreciated.