Heres my little problem. About two weeks back I put a 95 civic ex motor into my 93 civic dx, all went well and I put the p28 ecu in and wired up the vtec. Now about a week later I was riding down a back road when out of no where my CEL pops on, well my car was sputtering a little bit after it came on but then I turned the car off and then started it once again and the check engine light is gone and she runs perfect. Follow up to about yesterday when it did the same thing once again. It's not a huge deal since it only happens once in a while but I was wondering if anyone would have any input.

 

check the cel when the car is on, when the cel comes on, jump the service connector