1998 GMC Sonoma throttle body surges

1998 GMC SONOMA
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SUE MINCE
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Engine Performance problem
1998 GMC Sonoma 6 cyl Two Wheel Drive Automatic

motor starts then surges gas heavy then light. you can,see this with air cleaner off tried,new ECM no change, motor will do the same thing. porm form 1995 gmc 4.3 throttle,delco 9929 BJWN is only one that's works
I have 4 ASE,s have looking for vacuums leaks and all the small thing's
Mar 13, 2010 at 7:46 PM
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RACEFAN966
  • ASE Certified Mechanic
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  • ASE Certified Mechanic
Have you unplugged the mass air flow unit and started it to see if the surging quits?
Mar 15, 2010 at 9:11 AM
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