st170steve

Does anyone know of a decent garage in or around Manchester that understands ST170's? I've got a real need to get mine sorted but local garages seem to have no idea what needs to be done!!! I've got problems with a serious misfiring problem and lack of power at low revs. The car is reporting fault codes P0133 and P1518. Local garage says simply replace the lambda sensors and fit a new inlet manifold!!!! Reading through the posts on here, I'm sure that there will be a cheaper alternative if the mechanic knows what they are doing??????
Cheers
Steve