1985 GMC Safari no power

1985 GMC SAFARI
153,000 MILES • 6 CYL • 2WD • AUTOMATIC
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OLDTRUXROCK
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  • 1 POST
I'm working on a 1985 4.3 V6, The firing order is right, the timing is set, plugs are firing properly.. This thing starts excellent, however when I drive it and it gets to about 20 MPH, it falls on its face. At 20 MPH it starts to spit and sputter and backfire!...Is it loading up? or is the distributer bad? I don't understand, I'm sure its something simple.
Aug 10, 2010 at 10:53 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check and test the throttle position sensor and manifold absolute pressure sensor to include a fuel pressure check
Aug 10, 2010 at 12:18 PM
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