Hey guys, I recently started having problems with how my trucks running. When I start it it feels like its running on 3 cylinders. I had a lifter noise for a while and when its having trouble theres no noise. Ive reved it up to around 4k rpms and the lifter noise came back and the truck idle leveled out. Im assuming that means the lifter is getting stuck and it need work. Has anyone ran into this and how could I get that cleaned out and back in working order without replacing the lifter??? Thanks!