I personally don't have a speech impediment, but my car has a bit of a miss-fire on full throttle. I've only had the car 24hrs and don't know much about this car, as there are no receipts, but I'm told it has a td04 turbo, 440cc injectors and a turbo back exhaust, with what looks like a sports cat.

The boost needle flings around to 15-16psi very quickly and reliably every time. Somewhere up the rev range, with my foot to the floor, the car just kind of stutters. I've changed the plugs out today for iridiums as the old platinums were a bit dead and all had different gaps due to electrode erosion.

The car is a 2000 W plate turbo wagon and whilst I've had one before I wondered if the symptoms maybe would ring some bells with someone here?

 

I had the same problem on mine, it was the coil pack that was on its way out. Got a second hand working one and problem solved!

 

Thanks, I expected that might be a suggestion that came up here. It's pretty much first on my list to try, as I've had similar experiences with various other jap turbos.