In my experience there hasn't ever been a difference in power from changing a T-belt. One thing that can make a night and day difference would be running through some fuel system cleaner. A good highway drive of a couple hundred miles seems to work best. After about 150 miles I've actually had 2 cars cough hard a couple times and took off like bats out of hell. Greatly improved performance and fuel economy. I guess they were REALLY dirty. Personally I use chevron techron with good results. I've been hearing good things about BG but haven't used it yet.
Another point to check would be your air filter as that can choke your engine too. It should look clean and you should be able to see light through it.
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'94 855 5spd 'Drew' 201,500 Miles
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