Ka24e Engine 240sx Problems

[rocksteady_racer]

Here are the symptoms. When it's first started and not warmed it barely revs past 3000 rpm and runs incredibly rich. Then when it is warmed up, the idle is really low. It also won't rev past 5k-5.5k rpm at all. The compression on the engine is perfect. It passed emissions with flying colors last time. I replaced the fpr with an aeromotive one. I checked the pressure on the intake manifold and I checked the egr to make sure it was holding pressure - both came out good. However, the manifold pressure is bouncing slightly back in forth and my instructions for the gauge says that's caused by a rich condition. So which leads me back to it running rich but why? I think the BPT valve is leaking. I was thinking about swapping it but only if it will fix my problem since a new one is 70$. Thanks in advance for your help.