Quote: with a big cam there isn't enough vac to hold down the metering rods during idle. They stay up at full rich. The air/fuel screws do little if anything in this condition. I've only seen this problem with eddies when installed on big cam motors. Mine only had 7 inches of vac at idle in park and 3 to 4 inches at idle in gear. Now with initial timing set at 20 car runs super with no stumble. But did need to recurve the mech advance in distributor to keep total at 38 degrees
with a 280 MP cam the mixture screws WILL need to be adjusted out.Manifold vacuum is too low to pull fuel through the idle circuit. If he has 10 inches of vacuum at idle in park I'd be suprised. Mine was a tad lower. I think the stock orange springs in a 1407 or 1408 Eddy may be a little stiff. I think I had blue stepup springs in mine but if he has over 8 inches of vac in gear the orange shouldn't create a stumble. More timing will help everything too. I welded the slots on my distributor to give me 18 initial and 34 total.
