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Problems occurred after mods, no codes at this moment. I changed engine and same problem.

I have a 2000 mustang 3.8l and its running bad. I added a cai and some flow master exhaust that did away with o2 sensors and catalyst convertor. Car ran great but then bad. After initial startup car runs great but after a while of driving it loses power and sputters to the point of a slow crawl...