First it was bad gas, then the bad spark plugs, then it was just the front 3 cylinders( probably just the front two) So we did a compression test on my neighbor's 84 fj 60 w/ 200k. #1-60lbs , #2-45lbs , #3-135lbs, #4-150lbs,#5-150lbs, #6-145lbs. When I put a plug back into #2 the compression on #1 was 40lbs. I am guessing it is the head gasket, but could a valve be burnt? Doesn't seem to be loosing oil or coolant. When I used to own this rig the front two jugs had 135 to 150 lbs each. At one time this vehicle was stored improperly for a winter and had some rust inside the motor and I imagine it ate up the rings when it was run again. What do y'all think?