i just bought a mrt elecronic boost controller i got it all installed i am now in the process of tuning it i cant get the thing to hold steddy boost in higher numbers above 10 psi the needle will go up and down with in a few psi of the set psi the manule calls it surging or hunting it also says it could be a result of useing to much vacume line or by useing the wrong size can some one please help me out give me any ideas you might have thanks