KEVIN WARNS YELLOWSTONE IS A SINKHOLE WITHOUT HIM!

CROTCHETY TV cowboy Kevin Costner galloped away from Yellowstone - but he's obsessively eyeing the hit's multiple TV spinoffs and griping the shows are doomed to fail without his valuable input, sources spill.

Costner, 69, scored a Golden Globe for portraying patriarch John Dutton on the wildly popular Western, which lasted five seasons but spies say he butted heads with creator Taylor Sheridan, 54, over-scheduling and left to shoot the first installment of Horizon: An American Saga, his widely panned Western epic.

OSQUE Now, sources snitch the grumbling geezer is smarting over his passion project's lackluster reviews and poor box office returns!