I HAVE READ MANY POSTS ON TORQUE CONVERTERS AND TSS and Solenoid valves etc

My problem is all intermittent

After some hard drives I get the low speed "Bang Shift"

1 out of 10 hard drives


I get the 1744 about once per 10 drives

Is it the TSS or the solenoid valve?

GURUS please advise



1999 GREEN Contour SE SPORT Duratec V6, ATX, SUNROOF, 93,000 Miles, P0420 ON&OFF -replaced DS O2 --did not FIX *New TORQUE CONVERTER @ 53,000-Intermittent P1744 *New DASH at 53,000 and New DASH lifted-now using MOLLEY bolts to pull down