Why Check engine light on after fuel pump, IDM faulty inter Nal just replaced?

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Left Saab service, drove a few miles, check engine light & (TCS 0ff) light came on, engine sounded ragged. no overheating or stall. Turned off recent repaired AC, sounded better, slight fuel smell. I stopped let car idle. Drove slowly home w/o a/c. check engine light still on, no overheating. I have not tried to stat the caragain.