what is reason/solution for 2004 f250 (gas) stalling in stop and go city traffic on 2004 Ford F-250 Super Duty

after 1st occurrence, had regular service and replaced air filter. Problem recurred next time truck was in slow/standstill city traffic. To mechanic again,diagnostic computer identified a problem with speed sensor in the transmission. Sensor replaced and trans fluid changed. (approx. $400)and problem has resurfaced in less than 1 week - all occurrences in slow/standstill city traffic (approx. 150,000 kms)

by in Youngstown, NY on October 19, 2013
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2 answers 4 comments
ANSWER by , October 19, 2013
Try the idle air control valve and a throttle body service
COMMENT by , October 19, 2013
Thank you Girliy2000 - that sounds logical, wouldn't you expect a long time pro mechanic to have the same suspicion?
COMMENT by , October 19, 2013
I would!!! Especially since it's common!!
ANSWER by , October 19, 2013
Actually #-1 post a pretty good answer! Light on? If so another scan test is needed. Post the code number(s) and we will try to help. Autzone will scan it for free.
COMMENT by , October 19, 2013
Yup, I'll do that. thanks.
COMMENT by , October 19, 2013
U bet.