can boost creep just come on? my impreza been running 15psi for at least a year then i took out ecu to fit a chip en found out it was not compatible so i replaced ecu back into car.car ran fine for a week then i lost boost to 10 psi so i fitted a bleed valve to see if it could achieve and maintain 15psi which i could no probs.now ive fitted a hks evc set it up low boost set a 8psi runs fine and holds pressure if i switch to high set at 15psi somtimes runs at 15psi but sometimes boosts alot higher causing fuelcut ive lowered high boost but still every now and then overboosts is this boostcreep any advise
regards tony