Hi, I have a TD v6 hse 2005
When I take my foot off the accelerator, the needle on the Rev counter, goes up and down, and I can hear a hissing noise, from under the car. The car pulls back, almost like you are dabbing the breaks. We have taken it to a gearbox specialist who said it’s not gearbox symptoms. I have no warning lights on the dash. Apart from that, the car runs fine. Any ideas please.
-Bryan

Welcome to the forum Bryan, I can't help on this one, someone knowledgeable will be along shortly, doesn't sound gearbox related though, more like turbo hoses

Thank you Rosco that sounds better then gearbox problem fingers crossed let you know how we get on cheers 🍻