Miss Firing STI7 PPP
 

Started to miss fire when accelerating from 3000 rpm when in sixth gear. If i drop down a gear it seems to pull away ok.

Possible failing sparkplug, but would like to hear if anyone else had similar.

I have had PPP fitted for 8 months now with no problem until now.

I would replace the plugs, seems the most obvious and cheapest way of the elimination process :(