Okay joe, when u do the compression check do it both dry and wet. first u do it dry, take ur readings, and then do a wet test. Squirt oil in the spark plug hole( just a couple squirts), take readings on all four cylinders again and compare the readings. Ne cylinders that increase from the low cylinders are ur leakin cylinders. If all are good, refer to the owners manual on the readings. It could be possible valve seals or worn valve guides. check the crank case breather, and also check the pcv and make sure its working. U better stop revving your car so high, lol.