How i do PC injector\cylinder test ISX (hydrolic ones )

[un_yun]

I have a skip under load and boost. It passed the leaked down. I do not have insite yet. So I took a temp gun to the exhaust. All are 300 +/- 10 degrees. Except # 1 it runs around 240 degrees. Is sixty degrees enough to cause a heavy skip when loaded under a pull, but barely noticeable under light load. The skip seems to come on at high boost.