You need to be aware, that a fuel problem, can cause a misfire, along with spark--compression--vacuum leak, I can't name everything.
There is a bulletin about that spider fuel assembly, rough idle at start-up. The fuel poppets need cleaning. I can't tell if your problem is spark--fuel related or what. If your scanner will show live engine data, you might look at the fuel trims.
Wednesday, October 15th, 2008 AT 5:20 PM