I got my 96 Teg LS from a friend who was running a SOHC ECU on it, it ran fine but the revs were always a little high at idle so I wanted to get the correct ECU. Picked up a OBD2A P75 from a friend and now it sputters, almost like a misfire or like it isn't sparking right, was actually really bad this morning. Just replaced plugs, wires, checked the dizzy cap and rotor, there was some build up but cleaned it up and it ran a bit better. But still runs pretty shitty compared to the SOHC ecu. When I put the SOHC ecu back in, it runs fine aside from idle issues and sometimes being laggy when its cold. Could it be timing?