I doubt the issue is the ecu, but you are more then welcome to send the ecu back to have it tested using a wideband oxygen sensor to ensure the ecu is working properly.

(I would install one ecu and monitor the a/f ratios then install your ecu with the same program and monitor the a/f ratios etc.)

 

The cat should be in good condition. I doubt its the ecu either. But the itr chip had a dramatic improvement over the other one. But once I get to portland i will try out my friends obd1 ecu again and drive around a little and see if it drives the same or if it works perfect. If it does then I will send it back to you guys to check it out. Im also hopeing that the header will get here before the track so i can see if it might be my o2 sensor not being in or something.