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Pretty sure I know your issue... Its really common in gm cars.. It happened to my buick.. I found a site that has the fix I even did it myself.. when I took it to the mechanic they were trying to charge me 400+.. read over it Im sure it will help
First you must determine if the fuel is stopping or the spark is stopping..If the fuel is stopping this could be a computer problem.. If the spark is stopping then it could be the IGN Module in the distributer. or any nomber of sensors. Squirt a little fuel directly into the Throttle body on the intake manifold.. If the truck runs longer its probably loss of fuel.. Do this several times to make sure, be careful and only use a small amounty of fuel.. you do not want a fire.. RE: Spark: Take a plug wire and an old plug..put the wire on the plug.. hold the plug against a good ground .. have someone crank the engine .. does the plug stop firing? The engine dies.. and will not restart for a minuet or so.. during this "no start" time do the plug test. If the plug will not fire during this time take the module out and take it to Orillys Auto parts.. They can test it.. really expensive part. Don't replace until you know it is BAD..
It could be because of the battery. Make sure the battery and connections are good Try shorting out the starter solenoid if it cranks over-check and test the park/neutral position switch, ignition switch and ignition fuse 50amp.------------------------------------------------------------------------------------- VAS 5054A
Turning over and cranking are often the same thing, so Im not sure what your asking... Do you mean the car turns over but wont fire, or start? If thats the case and as you say the plugs are getting spark, then your problem is gonna be the fuel pump 99% of the time... Try this little trick, have a friend hit the fuel tank from under the car with a NON metalic hammer (ie a rubber or wooden mallet or chunk of solid wood etc) while your trying to start the engine. If the car fires up, then dont risk doing that trick again as it probably wont work twice, and get it to your mechanic to get a new fuel pump installed. If it doesnt work, (it really is a 50/50 thing) then get it towed and have the fuel pump changed as its still probably the problem...