[scottfab]

Tom
I really don't thing you need to recal or even worry about TPS, MAP deltas, AE, INT or BLMs just yet. I'd stick to the basics. The LT5 flat out does not do this is running properly.
Clear the codes and get it to do it again then see if any are set. If you're getting a lean o rich condition follow the trouble charts. They are meant for this. I had a sticking injector that set a lean code. The symptom was much like what you're describing. I put RC injectors in and the problem went away. That was 11 yrs ago.