Engine miss with power key on

[Razar]

I'm a newbie ZR 1 owner and hopefully someone can help with my question. My car is a 90 with 7600 miles. Original owner mainly never drove it. I just recently bought it and it appears to have a miss when the power key is on and the secondaries kick in. This happens from about 3,000 rpm's and up. When the power key is off it has smooth acceleration. When in a lower gear and accelerating half to full throttle it sounds like an old big block with that vibrato sounding exhaust note, however when accelerating in a higher gear it just mainly bucks but still gains speed. My mechanic thinks it is the injectors. I have run two cans of fuel injector cleaner through it but still appear to have problems. Could this be normal performance or is something definately wrong.

Thanks for any help.

Richard

Black 1990