No issues with speedometer when problem occurs. It is more like the tranny is hunting for gears. I replaced the VSS and remember what the symptoms were-speedometer flucuation and not shifting out of low gear.
I am hoping the MLPS is worn and causing this problem like Big Jim thinks. I know it is original and it is a common replacement part.
Any others w/ a MLPS replacement?
1995 Mercury Mystique LS OBD1
2.5 L Duratec ATX- No modifications
70,000 Miles w/ O.E. Water Pump  or 
Replaced: VSS, Lower speedo-cable(2X)
Use: Mobil 1 5w30 and Techron Fuel Treatment.;) and Mobil 1 ATF Change every 10,000 miles
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