I have an older 3310-2 that's been gone through. All proper sized orifices IAB, MAB, IFR and idling on a mostly stock 426W (not into the transfer slots). I get different behavior between the idle mixture screws. Driver side is just right about 1-1/2 turns out, Passenger side only works almost bottomed out. Perplexed. Needle looks nice, seat too. Every passage I can see is clean and unobstructed, gaskets (metering block and TB to main body) look good with no visible leaking from transfer slot to idle port. Any ideas? Everything else works great. Thanks, Nate