Bad O2 sensor or O2 sensor not working properly
O2 sensor senses the concentration of oxygen in the exhaust gases and send signal to ECU to regulate Air fuel ratio.
If O2 sensor is bad or not working then it does not work effectively so air fuel ratio is not maintained. And it may create following causes.
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possible vacume leak or bad o2 senor both can cause the pcm to add extra fuel to compensate.
There should be 2, one before and after the converter. Not sure on the no-start. But assuing it is a 3.1 motor, there may be coolant leaking fromt the intake manifold gasket or dummy shaft plug.
They are located on the exaust system, screwed directly into the exaust pipes, one on each side of the engine, right after the exaust manifolds.
You could start with getting a high flow airfilter. If gas millage is of little importance, you could unplug your o2 sensor go to http://www.westcoastfiero.com/ for more cool stuff
##O2