TPS....

also check for leaks. I have seen the tps do that many times. I have also seen minor leaks that do that as well.

Disconnect battery, let her sit and check again.

If still doing it..

Disconnect tb wire.

key to position 2. let sit for 2 mins

turn off

plug back in tb

key to position 2. Let sit for 2 mins, you will hear tb doing its reset procedure.

turn off

Start...

Also look for the small pipe that goes into the sc snout. It might have come loose.