I have a 1994 Mustang GT with 110M miles on it. First I put new BBK headers on it, flowmaster, and Holly cold air induction.
The problem I am having is it does some funny stuff when I drive it for long time in heat. It seems the auto trans shifts up while driving down road in drive. Like it gains 500 RMP then goes down. When I had this guy put in the Cold Air Induction I have tube that no longer plugs into anything. Anybody have any idea what is the problem. I did put in a new TPS and cleaned the throttle body out real good. Also it was overheating a little so I flushed and cleaned out the system and that seem to help that. The only problem I am having is the shifting problem and maybe a little manifold leak from when I put new headers on.

thanks for any help