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    Erratic shifting when engine has high idle

    Greetings, this is my first post so I am not sure if I am in the right place. I have a 1989 K1500 standard cab. 350 TBI. Occasionally my engine will idle higher than normal, say, instead of 800, it will go to 1500. Sometimes at the stoplight it will serge. When the engine is idling high the...
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