28ftsportcat

When adjusting air bleeds motor is changing trying to keep idle low

28ftsportcat

Also elevation is at 4000

MILD THUNDER

iTrader: (3)

The surging you are seeing should be able to be tuned out with the mixture screws and the proper idle speed screw setting

28ftsportcat

Thank u for your help

MILD THUNDER

iTrader: (3)

Good luck. Once you get it dialed in you should have a good combo.

getrdunn

iTrader: (7)

Can you be clear on what model 750 carbs your using? Are they the Holley hp 750 supercharger carb as was stated in mild thunders post or are they 4779-? This can change things up a bit.

Btw the surging at idle is common even on Mercury hi perf supercharged engines. You can calm it down some with tuning as MT stated but not uncommon to have a little lope even with that cam or any cam as far as that goes.