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Idles fine, will not accelerate and tries to backfire. o2 sensor or catcon?

(2002 Saturn L100)
in Wartburg, TN on September 24, 2012
the car suddenly started losing power and the engine shook really bad. it starts fine but will not accelerate. it seems to idle smoothly but when the accelerator is pressed the engine surges . And it seems to be backfiring when the gas is pressed.
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Popular Answer
on September 24, 2012
i would check for a stoped up conveter, you can remove the upstream o2 sensor or unbolt the exhaust pipe going into the converter, then start the car and see if it will rev up.
on September 25, 2012
I will try that. Thank you! If its the convertor, I already know how to fix that. a long rod and a
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