a while ago i was having problems with the ASV on the side of the egr. still am lol . ive changed the solenoid vaccum valve that links directly to this. slightly better as the car now starts and runs. however when ive done a few miles, its like the anti shudder valve doesnt work again. the car is very difficult to start and shakes all over the shop! but once started seems to run fine. has anyone any idea what it could be, or had any experience or knowlege on the vaccum valves that are all linked together?