My buddy has a 94 GT, HCI car with an SCT chip custom tuned. It recently started running really bad, seemed like it was running on 6-7 cylinders and had very slow throttle response. The car would fire up fine and then within about 30-45 seconds (closed loop I assume), it would just "blah" out. After much mechanical and electrical troubleshooting (including a new chip, pulled and ohmed the harness and a second computer) I decided just to pull the chip out. Tada!! The car runs about as good as you could expect for a bigger cam and bigger injectors. Put the chip back in, crappy running returns. Chip out it runs great. He tapped the #2 injector signal and you can watch the signal die off with the chip in but it keeps going with the chip out. What could possibly cause this load related issue?