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Many small things can cause this...dirty fuel, water in tank, fuel pressure regulator going bad, air filter clogged, throttle body dirty, clogged catalytic converter. First try fuel injector gas tank and line cleaner...least costly...use 2 bottles of STP concentrated injector cleaner...also add a bottle of liquid heet...to absorb any excess water or sludge in tank...worst cause could be low fuel pressure caused by bad fuel pump...Hope this helps.
i have a 1994 gmc jimmy 4.3l cpi. i could not pass the emission test.hard to start, spuddered, and smell of gas was strong. long story short, i replaced my spider injectors, good to go. $278 brand new from auto zone.
DIRTY FUEL INJECTORS FLOODING THE ENGINE.CLEAN INJECTOR BY.FILLING UP GAS TANK. PUT A BOTTLE OF FUEL INJECTOR CLEANER IN GAS TANK.DRIVE CAR FEW MILES SO THE INJECTOR CLEANER CAN FLUSH OUT CLEAN THE INJECTORS.
could be the fuel pump ...you will need to do a fuel pressure test on it ..the pressure should be 63 anything lower even so much as a few lbs will cause this to happen ...as well if it sat that long i would consider a complete tune up and check all vacuum lines for dry-rot
'puter wont deliver fuel if oil pressure switch is reading bad weak or faulty..or if ignition is not sending proper signal to 'puter....on the mechanical side...you could have a bad fuel pressure regulator sending all fuel right back the return line and not into the engine/ clogged fuel rail due to using some sort of nasty fule injector cleaner than turned the lines to jello inside..etc .etc.