When starting idle fluctuates from normal idle 700 rpm to 1500 -2000 rpm 10 min

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169000 miles. Owned 3-1/2 months. Issue is worse in cold weather. Once warmed up doesn't recur unless shut off for a while. This idle up and down sometimes happens when driving but not all the time. More infrequent. Bought in August, now November and this just started occurring, in below freezing temperatures. Other issue, wiper fuse keeps blowing. Replace fuse and blows as soon as you turn on the wiper.