Iown a 95 z28 when i get it above four grand it cuts out but as soon as i let off the gas it catched back up. Or if i gradually step on it and dont get to four grand it runs fine. I have replaced the fuel filter and plugs. Any ideas on what it could be? my next step is plug wires and or injectors. How hard are injectors to replace?

 

cuts out or mis fires? my is mis firing around 4k if i get on it. im thinking the opti is junk, and the spark is jumping across the cap. im getting the northstar coilsetup this month, so we will see if thats my issue