SV6 issue... misfire?

[VZ05SV6]

Got an issue with my 05 SV6 that I can't really put my finger on... basically whenever you're crusing along in top gear (say at 80 or 100 km/h) and put you foot down a bit, I get a kind of engine miss and a strong vibration / shudder, and the car goes nowhere. It's particularly noticeable when you hit a hill and need a bit more power.

It stops as soon as you take your foot off, or if you accelerate to the point where the tranny shifts down, it's fine as well. As I said it feels like a bit of an misfire but doesn't happen at any other time, only when you're cruising along in top gear and accelerate a bit.

Had the tranny (5 speed auto) serviced and checked last week, all is in good order.

Any ideas?

[AlexKaz]

Hi,

Sorry about digging up an old thread, but i have been experiencing the same problem as you. Did u end up fixing the problem?

[AlexKaz]

Anyone know what the problem is?