B18c1/ CRX/ chipped p28

Car runs great in all gears. After 10 mins of driving the CEL will come on and ecu will go into limp mode. I turn the car off to check the CEL and it runs good again (then repeats the problem). Iam unable to check the code b/c it goes away.

4/4/10: I drove the car until I got the check engine light. I have previously cut the A13 wire and drove w/ them twisted together. I left the car running and grounded the wire running away from the ecu, this made the cel say on and do nothing. Then I tried grounding the wire going into the ecu, this did not even display the cel.

I repeated both steps above the natural way (turn car off and into the on position). I got the same thing happen. Cel came on but there was no flashing.