1990 GMC C1500 surging and missing during exceleration

1990 GMC C1500
245,000 MILES • V8 • 2WD • AUTOMATIC
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ISLANDIST2
  • MEMBER
  • 1 POST
i replace the egr valve, map sensor, oxygen sensor, pcv, throttle position sensor. checked all vac. line.
the code reader still shows map sensor and oxygen sensor code .. i seem to be getting worse with each thing i replace .. what am i doing wrong
Sep 1, 2009 at 5:47 PM
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DR LOOT
  • ✓ASE Certified Mechanic
  • 2,311 POSTS
  • ASE Certified Mechanic
Everything you replace sounds like fuel related problems, change your fuel filter, and then check the fuel pressure.
Sep 20, 2009 at 3:50 PM
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