could be carb as bart sez - with a number of 5-9 trucks I've never had such a problem, except for one with a worn fuel pump actuator arm - try a new fuel pump

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics