i have a built ls/v ctr pistons skunk 2 cams cam gears stock bore ok so heres the problem ever time i hit v the check light comes on amd when i scan it its a code 3 map sensor. so i replaced it 4 different times and still same thing some one help!!!

 

Try looking at the map sensor wiring back to the ecu.

 

thats wat i thought to but its fine do u think it could be the ecu? the way it was tuned maby

 

possibly, i dont know a lot about tuning, but on my s300 software you pick/choose what map sensor you are using under the replacement map sensor window. possibly your map has the wrong sensor type selected.