Turn up, fill in the paper work pay the money and go.
You need a helmet, fire extinguisher, and finger to toe clothing, as well as having a car that doesnt leak oil/have bald tyres etc
Time to check for weird stuff now.
Did you leave a rag in the intercooler piping when you had it out the other day?
Have you tried starting with the throttle open halfwayish (foot on the accelerator pedal)