(bitabur @ May 27 2007,03:37) It seems like 05BusaLe probably has the right idea, but I keep thinking that it started right after you did a valve adjust...
are you sure you didn't put one of the cams back on the wrong tooth of the timing chain... it would make sense to me that at low speed one set of valves could be closing too early, not letting the engine run right.... at higher speed the engine might be able to flow enough before this becomes an issue b/c it's flowing faster, then when it's cold/not lubed up the valves are dropping just a bit slower, masking the problem, but only when it's cold.
Hey, this might be totally impossible, but it's just a theory, and like I said, 05BusaLe is probably right, especially if you haven't noticed any performance change.