question number 1) i have loud injectors these are type r injectors good or bad? 2) how do i know if i have a vacuum leak? i have a fuel riser when i first installed it a few months back when i shut off the engine the pressure would stay at a certain level( with the engine off) and it will take about 20 mins before it goes down to 0psi.. now when i turn off the engine the pressure will only take around 30secs to 1 minute before it goes down to 0psi how come? help me out! whats wrong with this ? do i have a leak in the fuel line? heellpp!!!