It sounds like the accident, not your fault, is causing these drivability problems. If that's the case, maybe you and your mechanic can show cause that insurance should pay the repair, or at least half. All your fuel components are in the back and the gas tank on this model was in a recall because of it's vulnerable position in rear collisions. In addition to the tank, there's the pump, the filter which also contains the fuel pressure regulator, and all those fuel lines. Incidentally, the 1999-2004 were recalled to be given a free trailer hitch which was believed to provide protection to the tank. I hope this gives you some "ammunition" to win some fair treatment.
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