Originally Posted by MouSe
What? If the only mod is a tuned ECU Iridium plugs will work just fine. It'* not like he'* running mods like you or Venom.
I'm sorry, I thought more work had been done than that. That'* what I get for skimming.
I've experienced this symptom multiple times and it has always been ignition based for me, although I've never had your wastegate code. Still not a bad idea to pull a plug out and check the tip. I believe it will start looking orange if it is glazing over. I believe once I got down to a 3.5" pulley is when mine started glazing and it happened pretty quickly.
I also had a coil pack fail. If you have a scanner that will tell you which cylinders are misfiring you can see if they match up with a coil pack and also try swapping to see if the misfires follow the coil pack. If you do end up replacing them ever, stick with factory coil packs. Myself and other members have had issues with aftermarket coils, especially once you start pushing more boost. Factory ones seem to be the best.
Does the arm coming out of the supercharger and going to the BCS move freely? At one point mine started to seize up. I hit it with some PB Blaster right where it goes into the supercharger casing and let it soak, the next day it was moving smoothly and it'* been fine ever since (that was almost 3 years ago I believe).
If you blip the throttle can you see the arm go up and come right back down?