I honestly don't think it was more than 50 bucks. To be honest if it runs worse now than it did before and that's the only thing you touched. Then it sounds to me like it needs replaced. I would understand if the part was 100 or more but for less then 100 even if the part is it bad yet putting a new one isn't going to hurt anything it would prevent problems later down the road.
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Do one thing every day that scares you. -Eleanor Roosevelt