At lower RPM it seem to take a little longer but, does the same. On the exaust system, I removed the pipe at the manifold and it did the same. Their is no load on the hydraulic. I messed with it a little today and I noticed that even at an idle now the engine will miss a little and idle smooth again over and over just about 5 seconds apart and the cycle is getting shorter at high speed, its now about 15 to 17 seconds. What ever it is its getting worse.