1997 dodge Dakota V6 magnum 3.9

163,000 miles on the engine started to lose power going uphill. Even when I kick it into passing gear

 

Tune up, clogged cat, clogged fuel filter, clogged air filter, brakes dragging, plenum blown, bad gas.....what have you checked so far?

 

Everything you suggested checked out ok. I did however fill tank up prior to problem. Truck used excessive amount of fuel also goin uphill as well as losing power. The next day, before checking out truck, had to stop for more gas. Went to different gas station. Everything on truck checked out ok now seems problem is gone. Drove it uphill no problem. Bad gas? I'll let you know if problem comes back.