Too much pressure in motor, NEED HELP??

My 88 mustang has to much pressure in the lifter valley at high rpms the pcv valve will relrase tons of oil into my intake causing my car to blow lots of black smoke. I have done a compression test and every cyclendar had 150# to 155# of pressure. So i dont think iam getting the problem from blow bye. What else could cause so much pressure in the motor? Also some times my motor will not run right under 2000 rpms, it will shake and shutter and sound like it is sputtering it feels like it is loading up with too much fuel to soon. But other times it will run perfect and there is no hesitation or sputtering at all. My fuel pressure seems very speratic also. It is any ware from 30# to 40#. Thanks for the help Saleenstang88

are you sure the intake is mated up to the heads properly.
ive had that full throttle smoking problem before ,used to smoke like hell when i opened it up,turned out oil was being sucked up between the intake and heads causing it to burn oil and really smoke,when i took the intake off there was a heap of carbon buildup on the back of the inlet valves

<font size=-1>[ This Message was edited by: steharz on 6/26/06 11:27am ]</font>