91 300ZX TT??
 

hey Guys, I was wondering if someone can help me diagnose a problem?
I have a 91 300ZX TT / 5 speed / all stock /
It seems to be skipping at and up to 2300 rpms, reving it up at idle or load.
After 2300 RPMS or so it smooths out.... It almost feels like a Harmonic Balancer problem or clogged catalytic

does anyone have any suggestions??

thanks

paul