Got FI? Need colder plugs? Cold Range Spark Plug Guide Recently, I encountered some difficulty with my FI application (Streetwerke GT380) where the car would misfire periodically, when cold, when warm, at idle, under boost... it was VERY frustrating. I had all manner of tests done to try and identify mechanical problems including compression and leak-down. All were negative (thankfully). In the end it turned out to be my spark plug gap! Now the gap was already set to a relatively tight .028" from Streetwerke but upon recommendation from another shop that deals with FI applications I had them t