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91 XT6 5 sp surges until 38k

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It surges in 2,3 and 4th gear until I hit about 3800 rpm then it takes off. I've done searches and a lot of people seem to think the IAC is at fault. It also stalls occasionally when downshifting. I can predict 99% of the time when it will stall just by seeing how fast the tach needle drops when I depress the clutch. It will drop fast, not a gradual drop to idle. This is my first and only "newer" sube and I don't even know what where or how the IAC looks like. Any and all help is appreciated as always. Just looking for some light. Thanks.



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