HAving the same problem with my 2001 1.8 non turbo. Ran lumpy, so switched off and started again. Fine. Would not start next day, unless pump primed. OK, but if parked on slight incline, will not start even after an hour. Replaced primimg pump and on the button, but still air im#n system when driving, i.e. fluffy idle at times and feels like it is going to take off occasionally when driving. Left running for a bit, then wiggled injector hoses.... not in great shape at bottom and can hear pressure loss (sucking) on one injector when rubber hose moved. Will replace injector hoses and update. Otherwise a good van, 14 years old, 75K and been a dream for a decade.
Jim
January 2015