Why is my 1999 chevy tahoe is idiling high when its in gear?

1999 CHEVROLET TRAILBLAZER
120 MILES
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UNKLE AL
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I recently put on a K&N air filter and replaced my intake manifold gaskets. I checked to make sure everything was tight, unhooked the battery to reset it, What am i missing?
Dec 13, 2011 at 7:04 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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