I think I had a similiar problem with my car. After having new exhaust installed, my car would rapidly rev and then die. Starting the car took a few attempts and then I couldn't go over 30 mphs. The problem stopped and I was able to drive normally. The check engine light remained lit. I took it to the dealer and they said it was the new exhaust and told me something about adjusting magnet-something-another. Anyway... they adjusted/calibrated/whatever for free.
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