I thought you were going to show a picture of my friends 928GTS with a mystery misfire!
Fouls it's plugs at low speed, runs like a bag of poo at high speed, great at about 45 in 3rd. We've been calling it the worlds slowest Porsche for a while!
Airflo meter, done
Plugs and coils, done
Porsche Dealer diagnostic £325 for 40 mins work! done