overrev

if this would go bad or not work properly, wut would some of the symtoms be.
My car had a small engine fire and has been a dcp motorsports for the past 4 to 5 months, darrel a dcp has been trying to get it running and just cant seem to get all the sensors working. I had to replace the relay one time but it was with a regular relay for the parts store. before the fire i was cut out anytime it was under boost and the check engine light would come on but i never could pull a code. Darrel was put a new harness and mess of new parts but is still have trouble with it. A new ecu has just came in today and he is going to try that. Any suggestions?