Got pretty similar problem with mine after yesterday.

Mine is sparking on all 4 but missing on idle, when you boot it it is o.k then.

Changed a few plugs etc....still missing on 2,4.

did find though when i unplug the injector plug on them there is no difference, unplug 1 and 3 the car nearly cuts out.

check if yours is doing the same.

think it is down to a sensor but not sure which one.

need to make a few phone calls 2morrow.



Dave.