further too aerotaff's comment I was told that the nuts need re-torquing when warm. What are peoples opinion on the correct torque? I heard 200 lb/ft but that is a lot less than Porsche centre locks according to other forums.

Nick. Most of those issues should be easy to solve they probably have occurred with it having little use recently. Mine had the stalling issue and I needed to replace a cam sensor and the maf. Just keep on top of the battery charge and it should be reliable.