My car ran fine ever since the swap, up to last night. I drove to my girlfriends house, and it was running like a top. She wanted to drive to practice her standard skills, and about a mile away the car started stuttering at times, not horribly, but it got a bit worse. I thought it was her driving, but when I drove it after I found out it wasnt. I drove it about 15 miles since then, with no cel. I tried some drygas, since the car sat for a week and a half recently with some pretty decent temperature changes (30 at night, 60-65 during the day).. No luck, it still was sputtering. Finally on the way to my friends garage the cel came on, and I am showing codes 1, O2 sensor, code 7, throttle angle sensor, and code 20, electric load detector circuit. I find it hard to believe that 3 things broke simultaneously, anyone have any inside info here? I am going to go through the troubleshooting flowcharts for the respective codes right now, but I figured someone might have some input that could be helpful. The car is a 1991 Si hatch with a dohc zc, running the stock Si hatch ecu.

 

I have no clue why it was throwing the codes it was throwing, but when I did a quick look through I found the tps was unplugged. Plugged it in, pulled the hazard fuse, and all is well.