My car seems to miss at part throttle but if i mash it it doesnt have the miss anymore.I have recently jetted my Demon 750 DP down to cure the rich condition i had but is it possible i caused it to go lean now?I am running 68 primary 75 secondary jets and #28 squirters.If i jump on it from a stand still it pulls strong and then it seems to lay down throught out the powerband.Fuel pressure stays at 6.5 the whole time and float level is fine.Plugs are clean,maybe too clean?!?!Should i go back up on primary jets?

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1982 Z28:355,4 Speed,Lots of bolt ons