I HAVE A 1998 Z28.IF YOU FLOOR IT OR JUST DRIVE NORMALLY IT RUNS FINE.IF YOU GIVE IT ABOUT HALF THROTTLE IT RUNS REALLY ROUGH.WHEN YOU GO UP A STEEP HILL IT WILL ALSO CUT OUT.COULD THIS BE THE IGNITION COILS OR A FUEL PRESSURE PROBLEM?THE CAR IS AN AUTOMATIC AND HAS 145,000 MILES ON IT.

 

Time for a tune up, maybe. Does the MIL lite come on or flash?

 

yea sounds like a tune up, i got about the same miles, i had to take out my whole engine and rebuild it, cause it stop holding oil pressure, might want to see if that answers your question

 

it wouldnt be a misfire or you wouldnt get your car to start

 

It could easlily be a mis-fire. The engine will run with a mis-fire, it will just run a little rough.