so i recently chipped my ecu and it was fine then i took off the plastic and pushed the wiring in a little so the plastic would be firm and the check engine light came and the idle was at 2 and a half then when i loosen the wiring and take off the plastic it stops? do you know what this is from?

 

its so basic what u wrote maybe if u had a bit more detail on what ecu and model year u was working on.. and a bit more detail on what u did might help someone to help u with your problem