Jonas It sounds like you are satisfied with the way it runs after it warms up. If that is true, then the problem is most likely the cold start valve - or, because it now does not run correctly when it first starts, the warmup regulator. I assume hot-starts are OK? The cold start valve is easy enough to check, just follow Hervey's instructions, however, the regualtor is another thing. You may just want to replace it and see, rather than trying to find the special equipment for the fuel system to test it. Harold McElraft - 3354