Robert, have vehicle scanned for diagnostic codes. Check for vacuum leaks and if you have not done recently give vehicle a complete tune up cap,rottor,wires,plugs,filter's,etc, including injector/throttle body cleaning. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
1999 4 3 misfiring
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Robert, possible causes-- Faulty spark plugs, faulty coil, faulty fuel injector, intake/vacuum air leak, fuel injectors harness is open or shorted, fuel Injectors circuit poor electrical connection, ignition coils harness is open or shorted, ignition coils circuit poor electrical connection, insufficient cylinders compression, incorrect fuel pressure,
worn distributor/gear were also a problem with GM's
Good Luck with your repair. I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info.
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