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My car sat for 20 days due to a work trip. I came back, it was dead. So I jumped it but when I turn the key to on. It flashed cat overheat light right away. I started it and ran really weird. When I pressed the gas it would sputter horribly. And when I tried to move if, black smoke came out of the exhaust. Could this all be due to a clogged catalytic converter or is this due to another issue? Thank you

-william

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running super rich, thus the black smoke.

does it sould like a WRX?

i would also blame an ignition issue or something electronic.

have you checked your coilpacos, afms, tps all the obvious stuff?

rich wont hurt the car quickly. see if you can clear it out,

if no isolate each cylinder by unplugging the coilpack. if one makes no difference thats your issue.

np, black smoke is unburnt fuel, you will probably get backfiring too depending on your exhaust.

your ignition is not burning the fuel or your timing/ ecu is causing the richness from false readings, just check all the electronics to make sure their reading correct signals and check your plugs to see which is fouling, might as well replace them anyway.

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