engine trouble part 2, it isn't the spark..

[New_BE]

Hello, ok i finnally got emough time off work to check and play around, anyays, there is good spark. and it's now running on 4 cylinders, 1-2-3-4 are running now, 4 just started today got it on teh road legally now, but not dribving it till this is working, anyways coudl it be stuck valves i got some rislone in there today and let it run a bit, now i got one more cylinder working, i was told that runing the engine, while only 4 of the cylinders are running the other two, the oil in them will be washed away by the gas that isn't geting burnt up is htis true, thanks

[grantman240z]

might have a bad head gasket or bad valve seals

[New_BE]

hey guys, so today i come home, start the car up, it goes, of course, take it for a small ride, as i am just leaving the yard i give it gas, a big cloud of smoke flys out the tail pipe, and i just fly, go for a ride, wow it has ALOT more power than yesterday, park it, check to se if it running on the last three cylinders, yup it is, not GOOD running but myabe after a bit more of running it will run better. anyways thanks for your help guys

[New_BE]

ok so i have been driving it lately quite abit, however I took it for a good ride, out to the lake about an hour worth of driving there and back at abotu 95mph or so...When i get back shes running pretty smoothly, then I go for a ride and i notice that the power isnt' there, so i check the cylinders to see if they are fireing, nope so i turn the car off check the oil, IKES that is kinda low not damaging low but just a tiny bit below the low mark, i fill er up on oil... voila i got six cylinders again..you guys think that i might have soem worn out rings on this old ride?? thanks