probably your car needs a comprehensive tune-up.
as for your distributor, spray some contact cleaner on the contact points in order to remove the corroded contact points. check also your high tension wires if they're still supplying strong current of electricity that your engine needs. kung extra budget ka pa, i recommend installing grounding wires, recommended din ito sa tsikot na medyo luma na tulad ng sa atin (1992 yung sa akin).
goodluck bro!