Intermittently downshifts for no apparent reason

1996 FORD FAIRMONT
150,000 MILES
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PETER CLARKIN
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1996 ford fairmont ghia 4.0 ltr 6 cyl. Intermittently downshifts for no apparent reason while driving. Sometimes selects neutral gear while cruising. These fault appears to be more common while the aircon is running \

My car has a tendency to shift gear erratically while driving at 100 kph on the freeway. It doesn't appear to have any other fault in the transmission and drives quite normally most of the time . It does , however, seem to be very sensitive to the slightest acceleration and will downshift with little reason. The problem also appears to be more frequent when the aircon is running.
Feb 24, 2012 at 2:57 AM
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RASMATAZ
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Do you have a check engine light?

Check the fluid level and condition of the tranmission-also check the TPS and VSS sensors-
Feb 24, 2012 at 4:30 AM
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PETER CLARKIN
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No Check Engine light. There have been 3 error codes on the engine puter. One about the Aircon. One about low vacuum and one about the throttle sensor. I recently had the car serviced by Midas. I assume they would have told me if the tranny needed fluid. It's one of those prefilled trannies with no dipstick.
Feb 24, 2012 at 8:56 AM
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RASMATAZ
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Test the throttle position sensor-also have the transmission further checked-
Feb 25, 2012 at 12:33 AM
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PETER CLARKIN
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Thank you for your reply . I'm having the tps checked asp and having the tranny checked out for any further faults.
Feb 26, 2012 at 9:15 AM