1994 Chevy Silverado hissing noise from throttle body

1994 CHEVROLET SILVERADO
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941500K
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Engine Mechanical problem
1994 Chevy Silverado V8 Four Wheel Drive Automatic 195k miles

I changed intake gaskets an now am getting hissing noise from throttle body,will not idle, backfires,and lopes like i put cam in it
Jan 31, 2009 at 4:15 PM
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JACOBANDNICKOLAS
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Hi:
If you hear a hissing sound, there is a vacuum leak. Make sure all vacuum lines are attached and not damaged. Make sure the throttle body is tight and nothing got pinched under it.

Let me know what you find.

Joe
Feb 2, 2009 at 12:48 PM
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941500K
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I have tried those things with no luck,thanks for the help though
Feb 2, 2009 at 5:03 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Have you tried using starting fluid to see of the RPM's change when you spray it near the sound? I normally don't like to recommend this because of the fire hazard it creates.
Feb 2, 2009 at 5:42 PM
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