Yesterday I drove the car to work and all was fine. Drove home for lunch, again all was fine, after lunch it would not shift until 3K RPM, regardless of pedal position. This was the 1>2 and 2>3 shifts, never go fast enough for fourth. Stopped, opened the hood to look for a loose vacuum line, couldn't find any. Got back in the car and it drove perfectly! Today I drained the fluid and put in a new filter and 3.5qts if mobil 1 ATF. On the way home it did it again Could I have an intermittant vacuum leak? Is my tranny on its way out Someone please help me, tell me what to look for. Could it be as simple as low fluid? I checked it but I could have misread the stick.

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K