i have an intermittent tranny problem. starts in second gear, shifts to third and no overdrive. no codes. a mechanic told me it was the vss, variable speed sensor. i unpluged the sensor, cleaned the contacts and plugged it back in. all was well for about 4 months. now problem is coming back. today i had to drive 60 miles one way with the problem. after shutting down for about 2 hours drove back, no problem. does this sound like the vss? tranny fluid is full, car only has 66k on it.