PROBLEM?
 

i have a 93 z its my daily driver. recently the car runs fine until it gets to operating temp then its starts stumbling and eventually dies. it starts right back up but does it again it passes after a while but im not sure what it is its not throwing a code. fuel pressure is good opti is new coil new and i have changed every thing ignition wise on the damn thing. and ideas? im going to change the fuel filter and fuel relay.

Try the fuel filters. That should be the source of your prob that should help.

?
 

just changed the filter and the realy did nothing?

Whats your temp running at? Might be far fetched but yank the thermostat and test it to see if the bitch is stuck shut.

well what ever it was finally puked car cranks but wont fire. getting spark but no fuel preesure the fuel pump is coming on? it was replaced not even a year ago.

If you're getting no fuel pressure, then its bound to be your fuel pump or sending unit. It doesnt really matter which one it is, because they come together. When you turn on the ignition before trying to start the car, see if you can hear the fuel pump priming. If not, then theres your issue.

it comes on for about two seconds isn't that it priming but still nothing i tried hitting to jar it but still no pressure