i have a 85 z28 305 tpi and it has a miss i have done a complet tune uo and still has a miss it idles fine but when u give it gas here comes the miss thank for any help

 

Start small, check all your electronics, TPS, MAP, Idle Air Control,etc. Make sure there all plugged in good and that there isnt any oxidizing on the plugs of the sensors, then check for cracked or broken vacuum lines, check timing, have you ran some injector cleaner to see if you have a sticky fuel injector? thats the stuff i would start with, mainly because it aint gonna cost much to do so.