Heidelberg Platen slows down

My Heidelberg Platen 10 x 15 has developed this problem. It runs fine prints fine, but when it picks up a sheet there is a definite “slow down” on the press as a whole. I oiled everything and no change, cannot figure this one out. Any and all help appreciated.
Thank you-

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It sounds like you need to adjust the clutch.


It seams to have gone away, after running a few hundred sheets. Maybe because the pump was cold and needed to warm up, been cold here in Colorado.