Update: Just saw that you are from Saginaw -- my parents are both from Bay City. Spent lots of time as a kid up in that area.
Upon entering open loop the engine is looking to the sensors for feedback to control fueling. Most likely culprit is a vacuum leak, but here are two
^^ What she said - great looking car and I like the color. Welcome!
Any particular reason for wanting to change all the sensors? The only sensor to "upgrade" would be your front O2 senders. Switch these out
I put the Trans Am and its other four wheel brethren to bed last weekend. Aired up all the tires, added Sta-bil to the tank and then ran each car for