after driveing my z for longer then ten minutes or so the stop in a store somewhere when i come back and start my car the engine feels like is goning to die and sometimes does. it only does this after being driven not cold start.

 

Have you checked your timing, spark plugs / wires, AFM & CHTS connections?

 

well i just replaced my distributor cap, rotor, plug wires,plugs,and i did an oil change but it started doing this before i did the tune upd

 

A somewhat common cause of this "stalling when hot" problem is a bad ignitor (two prong unit on the side of the distrib for non-turbos).

 

thanks i'll check it out tomrrow if its not raining,

 

Check the fuel pump, sometimes after the fuel pump warms you could (not common) have low fuel pressure. Look for vacuum leaks to. Clean the MAF / MAS with MAF cleaner...

 

280zx's have AFM's not MAF's. I know what you meant, but there is a diff.