check the pushrod for the fuel pump - might be bent or worn enuff to not pump well at higher fuel usage rates above idle - air filter won't affect fuel supply

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