Good transit mechanic in Perth/Glasgow? Vibration/Juddering

[Roob65]

Hi All,
Long story short - probably got done by a dodgy car dealer (don't really want to go into the ins and outs of it here). Bought a Transit Custom 66 plate 2.2l and it developed a few issue almost instantly. Need someone who really knows these machines to have a look and repair. Suspected injector issue and had a local mobile mechanic look (he drives a custom himself) but quoted £2.5k as worst case scenario for 4 injectors (£500 per injector), sump + oil. Price seemed a little crazy to me but maybe I'm out of touch? I don't know anything about cars/vans as it's a skill I never developed.

Get vibration/juddering, if it's there at lower speeds then I don't notice it but normally around 60/70mph. Stops when foot of the gas. Intermittent and sometimes more violent than others. Leaking oil, but not excessively.

Any suggestions greatly appreciated!
Roob.

[BHM]

you need to ascertain if its engine speed related or vehicle speed related.

BHM

[Roob65]

It's not doing it with the same revs at lower speeds as far as I can tell. Hoping someone can recommend a mechanic as I'm lost when it comes to vans/cars.