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Q:

Car will not go faster than about 5 miles an hour. on 2005 Volkswagen Jetta

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
No codes or anything comes up to tell us what it might be.
(1) Answer
codes never identify bad parts, just failed systems.

look at basics first. fuel pressure, cat converter back pressure among others. start here first.

Roy