ok i had a question, first off im whipping a 92 ford probe gt with manual boost controller and turboxs blow off valve and thats all and somtimes while driving it will only boost to a max of like 8 psi when the mbc is set to 14. now its only occasionally and i checked all lines, hoses and connections and there arent any leaks that i can see, feel, or hear. is this a common on turbo cars or is there something going horribly wrong?