It does sound like the catalytic convertor is restricted, I would go get a second opinion, and even a third. You can always get the engine code scanned for free at autozone. Also do not go to a dealer, they will go everywhere but the problem at hand, and charge you an arm and a leg. I would see if you can mimick the problem in your back yard and get it not to start, at that time, you should check the fuel pressure and spark/ignition. This may determine something different. But it will also tell you which direction to go in.
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Friday, September 10th, 2010 AT 1:57 PM