first check that the vacume line didnt just blow off, of the valve. if thats the problem just put it back on, otherwise check the vacume hose make sure its not clogged, try blowing through it, finally if thats not the problem then look into prices for the egr valve, and yes u can do it urself if u have to, its not hard at all, autozone or checker any auto place like that can order u a new one, but its probably not something they keep in stock. cant give u a quote on prices i dont remember