Ok new problem, I get a rpm surge while driving at just off idle, Not all the time every now and then. Seams to be more noticeable the first mile after start up then gets better. No CEL no tranny slipping(truck accelerates with rpm surge) fuel filter has only 1000 miles on it, but I'm running WVO 50/50 mix. I'm had filter clog before and this isn't acting like that. Any ideas?