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Hello to all who view this post, I have a 2013 Chevy Impala Lt that is acting weird when I have the cruise control set and it goes uphill. No matter how steep the hill is when I have the cruise control set it struggles to get the correct power to get up it. It does make it up hill but as it's driving the RPM's fluctuate and I can physically feel the car stuttering to maintain speed, I had the spark plugs replaced, intake valves cleaned, and a transmission service none of those helped. What's weird is it doesn't struggle uphill when I manually use the accelerator to gain speed to go uphill, I'm thinking it has something to do with the cruise control obviously but any ideas would be appreciated.
 
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