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Well the rotary air valve would make the rpms go up and down if this is happening then yes its possible but sounds to me when they put the sling when they did the transmission the broke the throttle body which is where the cable goes im 99 percent sure they need to replace that throttle body as this wasnt happening till after the tranny repair make sure they replace the throttlebody and order it tonight so they have it for tomorrow or they will have your car another night also you are entitled to a rental or loaner car make sure you get one
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