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Poor running STS

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My 96 STS is running poor. Car has 82000 miles. I recently changed the oil and filter, fuel filter amd air filter. The other day service emissions message was flashed. The car lost most of its power and will not shift right, unless you let off on the throttle. Trouble code was set for P0101 - Mass Air Flow (MAF) Sensor Performance, and miss fire detected . I checked for leaks and items in the intake tube, found none. Replaced the MAF, no change. I replaced wires and plugs with delco parts. Car ran somewhat better but not 100%. It sounds like it is not getting enough air.

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