if you look under "pages" and "tech" you will see write ups on running issues. these are detailed guides to fix problems with hunting/bad running.as far as the exhaust it could be down to that side of he engine not working. first, see if there are any error codes. secondly get information in the tech section for cleaning all the connectors and checking them for correct seating. if the car is still not running right after that you will have to do a few more checks, coil pack working, injectors resistance, TPS voltage, timing, fuel pressure and more until you find the problem. best of luck.
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