Likelihood of bad valves.
My 02 Ranger Edge 3.0 2wd has a really bad miss. It's not throwing any codes. The previous owner said that the Ford dealership did a compression check and cylinder 6 has no compression and that it needs valve work. I'm just wondering, before I go taking off heads and such, how likely is it that the valves are stuck compared to the piston rings being fried. I would think that if it was the rings, I would at least have some sort of compression. I could see where I would have no compression if the valves were stuck open though. Anyone know of an easy way to check this? Thanks.