chevy s10 surges between 45-55 mph

2010 CHEVROLET
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GRUMPYIM
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I have a 2000 chevy s10 2.2 liter auto with 97000 miles and when I drive it staying below 40 is fine and above 60 it's fine. However between 45 and 55 at a steady speed it surges. I changed the plugs, wires, and fuel filter, and I still have the problem.
Any ideas would be appreciated...
Feb 11, 2007 at 12:01 PM
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CHEVY22
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has the fuel filter been changed yet ??
Feb 19, 2007 at 12:11 PM
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GRUMPYIM
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yes I changed the fuel filter, changed plug wires, spark plugs and it still surges.
Feb 19, 2007 at 12:45 PM
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CHEVY22
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check engine light on or flash at all
Feb 19, 2007 at 12:49 PM
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GRUMPYIM
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no check engine lights are on--transmission place said it was the transmission and wants to put in a trottle body kit for $450.
Feb 19, 2007 at 2:15 PM
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CHEVY22
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valvebody,

if that is the problem , if , that is a fair price , the pcm should still kick out a code at least p1870
Feb 19, 2007 at 2:55 PM
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GRUMPYIM
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would you possibly have any other ideas on what to check for to remedy this problem?
Feb 19, 2007 at 4:35 PM
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CHEVY22
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not really , its a weird problem, thats all i can come up with without looking at it ,sorry
Feb 19, 2007 at 4:44 PM