I just put new coils on my truck because it was misfiring and it fixed the problem but my mechanic didn't apply the dielectric grease so I just had him do it, he also blew out the wells with air. So I took it for a road test and it started to hesitate on me and my engine light was blinking of and on but my truck would smith out after a couple of runs and the engine light would go off. This is so aggrivating, can anyone tell me what might have happened after he blew the wells and sol lied the grease correctly ?????