87 b2200 running weird. haaalp

alright, so after solving some other problems with the truck, ive been having this weird thing that once my truck warms up (like 5 mins of running it) it starts running reeeally rough, like when i try to accelerate itll stutter and hesitate and sometimes not go anywhere. or stall. could it be the o2 sensor?? bad cap? also i have a nasssty exhaust leak, could that be any part of it?

yes ,yes ,yes and yes...lol any of those can make it do that...start with the cheapest and fix things

agreed do cheap things like new spark plugs and new fuel filter first