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Recently I had my cat converter replaced. Car drives fine. Occasionally I get service engine light. I try to pull the code and get either C12 or nothing. Today it stalled twice but cranked right up after a restart. Full tank of gas, fuel injectors are good.
your computer sets a code when something it is monitoring gives no signal or a signal out of range. So stall + no code points to something not monitored. My first guess is going to be a fuel pump in the early stages of failure. you state "fuel injectors are good", did you test them with a Ohm meter? Not really feeling a bad new converter as a possible cause when normal driving is good.