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Hey I-Drive,
You've got to get that car in a shop. A couple things come to mind right away.
Backpressure, ahead of the catalytic converter needs to checked, and fuel pressure needs to be checked. Both will cause multiple misfire codes, and both problems would be worse under heavy throttle loads.
You might get lucky and have a blocked up fuel filter.
Good luck! Don't forget to let us know what caused the flashing lamp.
Jagg
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