Hi all. After 12 years sitting in the garage I decided to put my mk1 Golf Convertible GTi 1.8 Rivage back on the road. Small overhaul of brakes and rubber and MOT is passed. It always had a minor issue of rough cold idle and hot start problem which never bothered me too much but I’ve decided to get it running sweet. System and control pressures were high at 5.8 & 4.4 bar respectively. No apparent blockages so I removed the shim from the regulator, pressures now bang on at 5.2 & 3.4bar (cold pressure 0.8bar). AAV and cold injector fine. A tweak of the CO and idle screws and idle is good. Trouble is when I switch off the holding pressure rises to 4bar. It will hold there for a good half hour or so. Has anyone seen this before or know what might cause this and if it will affect hot starting?! Many thanks in advance.