One of my cylinders is misfiring and I can't figure out what is causing it. I'm currently running some "sea foam" through the fuel system trying to clean out the injectors and valves. I've also changed the spark plugs and neither has helped it out a bit. My car has about half the power it normaly does and it shakes really bad. Also, the check engine light is flashing. when driving it I have to run it up to about 3500-4000 RPM's before shifting or it bogs down really bad. Could it be clogged injectors, sticky valves, bad plug wire, bad ignition system, fuel filter?? I'm really not sure. I would rather fix it myself b/c nobody around where I live will work on a VW, and I really really don't want to take it to the dealership.......because they pretty much just suck (as I'm sure everyone is aware of) Any input would be greatly appreciated!