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Re: Service Engine On... Transmission?? MAF??
The MAF sensor could cause erratic shifting but it sounds more like you have other internal problems with the tranny. Possible PCS or 3-4 shift solenoid at the valve body. To scan for tranny error codes you need an odb-ii scanner that is trans. capable. Also, since you are missing OD (4th) you could have a mechanical problem like the 4th clutch or a spline.
On the MAF sensor error I would reset the PCM and see if it repeats. But P0102 is typically a bad MAF sensor.
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