ok i bought a 1993 z28 and it had some problems when i bought it.
2 of the motor mounts were broke but after i fixed that it developed a new problem.
if i hit about 5k rpm it tries to cut out like all the gauges dip and i loose spark, but in order to get it to stop i have to kill the car and restart it.

sometimes itll run all day no problems.

 

hay welcome to the forum. are there any aftermarket ignition add ons? does the ses light come on? and have u had it scanned for trouble codes?