Took my car there running fine, it would start and...

Took my car there running fine, it would start and crank with no problems just a little lag........ after getting a 2500 quote and advised them that I would like to think about the repairs. I went to pick the car up and all of a sudden it doesn t start and they now have to do another diagnostic to tell me what the problem is when I drove the car there running!!!!! THIS IS THE DEFINITION OF JANKY MECHANICS!! IF I TELL THEM I WANT THEM TO FIX THE CAR, I WOULDN'T BE HERE NOW!! PARTS QUOTE FROM THEM WAS 32$ Went to advance and saw it for 12$ Another part was 179$ from them advance had it for 75$. AAA RECOMMENDS USING THEM!!! BE CAREFUL!!!