problem with shiftkit...

My shiftkit on my 04 cavalier 4 speed auto 2.2L eco is being kinda funny...occasionaly it is not shifting on time and overreving not that big of a deal if im careful but making sure its not a huge problem..another thing is my check engine light comes on and off if theres a way to stop please let me know otherwise can someone tell me how to unplug it? Thanks

Oh and i know the check engine light is because of the shiftkit

what shift kit is it?

Its a b and m shiftplus kit off of turbotech racing

Are you sure you tap'd into the correct wires and were the good splices?

Im pretty sure it was the right wires and i had good splices now its kinda bogging down when i take off..when it finally speeds back up after about 5 seconds it feels like im on the bottle really wierd, im just keeping off til i can figure out whats up