1991 Chevy Cheyenne backfire when engine is warm

150,000 MILES • 6 CYL • 2WD • MANUAL
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DAMMTRUCK
  • MEMBER
  • 2 POSTS
Truck runs good when its cool but gets worse the longer I drive it to the point it seems like it runs out of gas. Have replaced fule pump, fule filter, spark plugs, plug wires, distributer shaft and every thing up from there to the plugs and the coil and idel control. Also replaced the intake gasket and catalytic converter.
May 26, 2010 at 11:54 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Test the throttle position and manifold absolute pressure sensors.
May 26, 2010 at 12:00 PM
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DAMMTRUCK
  • MEMBER
  • 2 POSTS
Thanks for the help. Where are the throttle position and absolute pressure sensors located?
May 27, 2010 at 1:22 PM
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