Definitely check your fuel pressure @ injector rail. If pressure is ok, then you may have a faulty float on pump assembly and would need a new one. If the pressure is low check the pressure @ the fuel filter on pump side. If pressure is good replace the filter. How many miles & when was last tune up done? Is the check engine light on?There could be a problem with the ignition system as its OBD 1 & minor issues may not set off your Check ENG. light. There are virtually a number of issues that could cause a hesitation.