Do some real tests like check for a loose vacume line, gap in your spark plugs, fuel grade, intake manifold leaks, compression test, you know things like that

These can all contribute to sluggish performance.

It's pretty rare some one puts an entire motor back together correctly on the first try even if you have been doing it for years!!!



What have you been driving in the mean time while your VX was getting worked on? Something with a bigger motor and more pep? this could also make the VX feel sluggish to you after getting use to the spare/rental car after a while.

Take it back to the dealer that performed the work and explain your concerns to them. You might be surprised what you find if indeed there is something wrong.

just food for thought