Check powertrain - engine cutting out

[Uldis Esots]

Hi guys, first time here and hope you can assist. I've had a VZ Acclaim for approx 6 months. Initially it had issues with the engine cutting out & check powertrain warning light coming on- I took it to a Holden dealer and they found a loose vacuum hose. Problem fixed. In the last month it's started cutting out again, approx every 200kms, usually whilst sitting at the traffic lights or at low speed. I took it to a Holden dealer and their checks couldn't produce any fault codes and road test couldn't fault it. A friend has suggested possibly a cracked exhaust manifold, although I'm guessing an injector problem or something electrical...any ideas? The problem has really only been at low speed or idling. :cry:
PS, the dealer has checked the oxygen sensor and couldn't fault it.

 

[andyman]

does the car idle rough? can you hear a vacuum leak at all?

 

[Uldis Esots]

No...the car's idling perfectly. Went for a drive of approx 200km yesterday on country roads with no problems. Also can't hear a vacuum leak.