Trey-von

The guy that owned car before me had a autogauge monster memory tach and i wanted to get rid of it bc it wasnt functioning right and the original tach on dash worked fine, so i clipped the wires to the tach which the green went to the original tach wire on the wiring harness # 35 at the ECM. the power supply was to the fuse block and there was a good ground. So after i clipped wires the car turns over but want crank, it sound like its jumping time or is not in correct firing order and i have checked every fuse and relay and they are fine. I even hooked tach back up and still did not change anything. If anyone has an idea what i disturbed when i took tack off please let me know thanks.