Check Engine Light, why does it keep comming on??? Options

[mark920]

I recently had some work done to my car, new head gasket, and all the parts associated with changing that. I was messing with the pvc valve on the intake manifold and brittle hose broke well when i started the car obviously it was sucking in too much air and made my idle very erratic well this caused, (well i think it is the cause), my check engine light to come on. I have fixed the problem and put on a new pvc valve and reset the ecu countless number of times but the damn check engine light comes on still. So i did the diagnosis where the light blinks a certain amount of times to tell you the error code and it said it was something to do with the rpm signal. I can find nothing wrong with the car and the damn light is still there??? I dont know how to get it off or fix whats wrong to get it off, i can find anything wrong!! Anyone have any ideas?