after tune up engine running terrible

1999 CHEVROLET TAHOE
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SHEILA JACKSON
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I have 99 Tahoe just had it tune up now it will only do about 20 mph they seam to think it has jump time can you help me with this.
Dec 19, 2011 at 8:34 PM
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HMAC300
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if it's a 350 then bring engine up to #1 with harmonic balancer showing around "O". take dist capoff and it should be between 11&12 O clock. that is where it should be. it also may be the dist gear is worn on the shaft.
Dec 19, 2011 at 11:21 PM