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Re: Tuning or fix jetta 'goes flat' ~4500+RPM (phart2005)

All I know is I had virtually the same car as you a few years ago and it did almost the same thing.... couldn't figure it out until one day my timing belt snapped. I guess at low revs it held together but once the revs got closer to 5000 the belt was stretching and the engine was losing power due to the valve timing being all goofy. Might be worth checking.
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