Hello I just recently bought a 2002 honda civic ep3 with the k20 5 speed Trans I have a few questions currently it has 229k on dash and i know it currently needs a knock sensor but this morning when I woke up to go to work temperature outside is currently 27 degrees and when I started it it started running rough like stuttering and I popped the hood and checked oil and noticed there was air pressure coming out the dipstick tube not a normal amount of air but could someone point me in the right direction please thank you
-Justin

 

welcome to the forum. do a compression check to see if there are any valves/piston rings or head gasket failing.