right my saph coss 4x4 was running ok one day drove round the block all was good parked it up got in it next day went to start it to take to mot station and it wouldnt start i found the fuel pump werent primeing so messed about then packed tools away and left it next day i cleaned cps sensor went to it and it started ticked over for ages went round block again and it was boosting perfect at 30 psi and was driving fine then i noticed boost playing up then it stopped and cut out no fuel pump again so i ran live to it and drove it back home when i started checking again i had no live at amal valve either and no fuel prime did an oil change and then it started again any ideas on what this can be as i am running out of ideas thanks chris