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How many miles on the vehicle?
In general, I start with plugs and wires, and look for any oil that is getting around the spark plug boots. If it truly does run fine at higher rpm, then a vacuum leak is a real possibility. Check all hoses, lines, and connections.
Is the "check Engine" light on?
If so, you will want to pull the trouble codes, and use the code as a start point.
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2003 Jetta left rear window blue plastic part of the