My 94 Dodge B150 van (about 150k) with a 3.9L tbi stalls at highway speeds. No bucking, coughing, rough runing or any other warning symptom -- just diesat 60 mph. Also dies at low speeds and sometimes also at idle -- same way. Sometimes it will restart imediately, sometimes I must wait two or three minutes before it will start. Did complete tune-up: air & gas filters, wires, plugs, cap, rotor, egr valve. No codes set other than egr. Drove it about 200 continous miles at 65/70 mph with no problem. Next day it stalled four times within 30 miles at 65 mph Doesn't appear to be weather related - stalls on both wet & dry days. Anyone have any ideas here?