edelbrock carburetor secondarys

Thnaks guys, i'm expiencing a strange problem and i have 2 books on the edelbrock carburetor on is by larry sheppard aand the other is by dave emuanal. Instead of starting a new thread i thought i would explain whats going on in this thread.
When i fire up the engine and let it reach operating temp i can give it some throttle and when i hold the throttle steady at 2000 to 2500 rpm i get a surge but ony while the engine is in park or nuetral. When there is a load on the engine this surge is not present. Anyone have any idea as to what could be causing that? It is confusing me i thought maybe its ignition but i have a brand new mopar performance distributer and i set the mechanical advance at 18 degrees so i could run 16 degrees initial and 34 total and i changed my springs so that all my timing is in by 2800 rpm and it starts to come in around 1200 rpm.
My ignition module is a brand new and its a standard same with my ballast resistor, my coil is brand new as well and its a borg warner select. When the engine is running at an idle i am getting 7 to 7.5 volts at the coil 13.67 is what the battery has while running and on the run side of the ballast resistor i am getting 13.0 volts and on the coil side of the resistor i'm getting 7 to 7.5 volts.
I'm running out of idea's as to what this could be. My last two places to look would be fuel pressure and the float level. Would the float level being off cause this to happen? What struck me most odd about this is it only happens while in park or nuetral when i'm cruising down the highway or cruising around town there is no surge to it at all. But as soo as i put it in park and try to hold the gas steady t 2000 to 2500 rpm i get a surge and i can hear it thru the exhaust. This is my most recent problem i am trying to solve. Once i rev up past 2000 to 2500 rpm while in park or nuetral it smooths right out and runs nice and strong. But again while i'm driving it there is no surge what so ever. You guys ever sen anything like this before?