Working on our '89 Lerado(258,TF999) looking for a vacuum leak and I discovered it has a Decel Valve on the engine. This is the 3rd or 4th engine in the Lerado from what I have been told by previous owners. I know this engine came from a manual tranny Jeep as I helped my wife put the engine in when I first met her. According to the diagram the Decel Valve should be plumbed into one of the pulse air lines but it wasn't it was just open and there was a hole in one of the hoses to it.Also according to this vacuum diagram the Decel Valve shouldn't be on a YJ with an automatic. Should I eliminate the Decel Valve?