I have an old "stage 2" chip that was in the car from the previous owner. The chip worked fine in the car for a few years throughout me owning the car and then the car sat for a few years and a not so reliable shop(learned later) told me it was causing an issue I had which caused the car to stall when put in gear if not power braked. Seeing as this issue still rarely occurs with the chip being out I'm starting to assume the chip was never an issue. If I was to plug the chip back in could it cause the car to throw codes that I would have to bring some where to get them reset or would I be able to just take the chip back out without harm if something seems wrong?

 

You might try the chip again if it helps with engine modifications.
Your issue could be multec injectors or even park neutral with.
If it throws a code 41 or 51 contact Ed wright and see if he can reborn you the chip.

 

sounds like an IAC/TPS issue to me.