Visit the on-line store, known as reliable-store, they have the repair manuals. I'm sure
you will get the solution of your problem.
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SOURCE: 1999 GMC Jimmy Startup problem
My friend had the same type of symptoms, there is a spider wed style od hoses under the intake that delivers fuel to all the cylinders that he found to have hairline cracks in it. Found out this is a know problem especially in the 4.3L Vortex
SOURCE: HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.
Try replacing the ignition control module it is located under the distributor cap Cost is around $30.
SOURCE: starts then dies
Aftermarket pump or OEM? If aftermarket, take it back and get a new one. Before you go through all that though, you may want to check the fuel pressure. You need to check the specifications on what the pressuresupposed to be for this model.
SOURCE: 98 gmc jimmy loses power to a stop
the fuel pump could actually be malfunctioning. and the reason that you are able to restart and drive again is because when you turn the key on it is allowing the fuel pump to pressureize your system. but while the fuel pump is continuasly running it is loosing the fuel pressure. this is common on the cheap fuel pumps. i am not sure about were you got the fuel pump from but in all of my experiances with this problem i find that the fuel pumps have been boughten at a napa store.
i hope this helps you out.
and you could attach a fuel pressure gauge on to the fuel rail and start the car and watch the pressure to see if it is droping.
SOURCE: 2000 GMC Jimmy won't start
i had the same problem and replaced the fuel pressure regulator. Cost about $45 at advance auto store or about $90 at napa auto stores. Once i replace that my truck started right yup and runs like a champ
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The 4.3 requires a minimum of 54 psi to start but will run on less once it is started but absolutely has to have a minimum of 54 psi to start.
if applicable, check air idle control valve for loose or broken hoses and valve it self. If carbureted I'd say rite off accelerator pump. if trodel body injection in turning key to start gas should shoot into body, you should be able to see it. If not it could be dist module in any case in turning key to start with injection gas gets put into engine peddle has nothing to do with it. Hope some of this mite help, good luck,
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