Bucking Under Power

New guy here.
I have a 1996 C-1500 with a 4.3L v-6 and 5 spd manual trans. Recently purchased it and starting to notice the truck bucking when under a load while shifting. It feels like the engine is missing but at idle or steady speed, it runs smooth. Any help would be appreciated.

eh....mine did that while under a load and after unloaded, then the tranny went out. Might not be you problem but check it.

Check your plugs and wires. Make sure you don't have a wire off, or cracked. Check the distributor cap for any carbon and/or cracks. If you see any, then get ya a new one and that should solve yoru problem.

Thanks for the help. Changed the plugs, wires, cap & rotor. Seems to have taken care of the problem....

Glad to have helped. I'd say the distributor cap and rotor button was the problem, but changing the plugs and wires never hurt anything!