Have 94' Z28 have replaced optispark cap,plugs, wires, ign. mod., coil...it runs great while its running but keeps dying, no SES light on just dies riding down road, has no CPS so i dont know what it could be but its driving me nuts. ANY HELP PLEASE

 

does it just cut out completely like the key is turned off? Or, does it sputter?

If it just cuts out, heck, it could even be the ignition switch. If it sputters, have you checked fuel pressure?

 

Sounds like the fuel pump but like torque said put a fuel pressure gauge on it and see if the pressure remains constant.