S-10

Tiny
BILLY12
  • MEMBER
  • 1994 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
1994 S-10, 4.3 Vortex, jumps from OD to Dir. While driving, also while sitting in park will surge about 400 RPM'S, up and down.
Monday, July 11th, 2011 AT 8:48 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,874 POSTS
The surging is typically due to a vacuum leak. When the engine is still cold, use a spray bottle to squirt water on the vacuum hoses and intake manifold gaskets. If you see the water get sucked in or you notice a drop in engine speed, look closer in the area you're spraying.
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Monday, July 11th, 2011 AT 9:09 PM

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