Bogging out at 60mph

On my way home from work today, and doing 60 on the freeway n i noticed that the motor is bogging out when I hit the throttle.. I let off and it idles.. at first I thought maybe I'm running out of gas.. due to my gas gauge dnt work.. any thoughts on what it might be or where to start looking? I just got this truck and previous owner did a full tune up about 2 yrs ago n never drove it after that.. it just sat in his garage.. he replaced all plugs and wires, oil change, new cap an rotor, master cylinder along with brakes.. it's an 86 b2000 with a 190k on the o.d.o pls help! Mahalo! (Thank you)

Maybe the fuel filter is clogged.

Yeah, fuel filter or plugged catalytic convertors.

Ok thx guys.. I'll try changing it n see how it runs after that.. it's funny tho.. it didn't do that on my way to work this morning..