tune up or vacuum leak would be first on my list.
check fuel pump/filter(s), t-chain, or float/needle valve or carb rebuild.
tune up, carb adjustments, and trouble shooting info can be found here,
http://www.autozone.com/autozone/
it's an online manual for your truck. it's FREE. just sign up, plug in vehicle info, and go to, "repair info".
owner 88 toy pu 4x4 22/20RE hybrid