Ok I'm knew to the fuel injection been running a 85 carb. But just picked up a 90 gt great deal couldn't pass it up here is the trouble. The motor is all stock but it does have a super chip ,cat back, 3.20 something gears, came auto he had it swapped out to t-5. When I got it the guy sad it surged when you first start it which it does when the motor is hot are cold but doesn't always do it when you start it and after you drive it are let it set awhile it stops. Does fine at the stop lights and stuff been driving it about a week know any idea what could be going on remember I don't know that much about fuel injection so you need to spell it out for me.

 

Could be a vacuume leak