Hi wondering if anyone has had this problem with there 16v recently I've noticed my car seems to be low on power low down up to about 4000 rpm as a little hesitant but does run fine. Has anyone got any advise thanks

Problem FIXED! It was a fault with acav my inlet flaps wasn't moving fault turned out to be with the T piece in the vac pump and has some sort of one way valve in it and that's where the vacuum comes from to operate the system.

That piece is usually the most reliable part of the ACAV system, apart from breaking off the thin pipe yourself when removing it.