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2 years old. It did it when it was new out-of-the-box.

I meant to add linkage plunger is in the top hole like it came.

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When I bought my 70 Duster 360 combo the Edlebrock 750 carb had an off idle stumble. I moved the accel pump linkage from the top hole to the middle hole, the stumble went away completely and I bumped my intial timing up to 20 degrees with my Comp cam 280H. It was getting too much pump shot on mine I figure. Carb runs great plus I use a 1" 4-hole plastic spacer. The #1407 carb is stock except I went one step richer on the rods.

You might be going in the wrong direction.

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I meant to add linkage plunger is in the top hole like it came.

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That could be your problem right there. Watch the pump arm movement while operating the throttle. The pump arm must start to move as soon as you move the throttle. If the pump arm has a slight delay, there could be your lean spot. Choose another hole in the pump arm so the pump arm is moving as soon as you touch the throttle.

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Thanks for the tips guys. Pump arm starts to move as soon as the thottle is broke. Edelbrock Performer RPM. No room for a spacer. No check ball or block under the accel pump nozzle on the 800. Just a spring. I put the .043 squirter back on (removed the.052), moved the accel pump arm to the middle hole and will try again. I have the blue 3 in. Hg step-up springs in it now. Plugs don't show a lean condition AT ALL. I could try to richen the primary circut up one step. I am hoping it was a vacuum leak. Put a new intake gasket on. Would changing back to the OE orange do anything?

Sputnik, Thanks for the link.

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I played around with my 750 when it had this problem, Almost had it gone with the squirters incresed to around .056", opened up the IFRs, this was on a very mild 440 with good man. vacuum (around 20 in.), As the temp changed in the manifold it would affect the Eddy, even though it had a Phenolic 1/2" spacer & the carb was cool, the pump would squirt fuel the second you touch the throttle, it was perfect in that area, I came to the conclusion its in the metering in relation of the boosters, I installed an old 3310-1 holley & it was a done deal, Even tried an 850 TQ, That ran the best (power wise) WOT but was finiky.

Heres the why i see it, I had 2 factory Mopars back when, A 70 Sport Satty, 383, AVS carb, & a 66 Monaco 500, 383 with an AFB, these were both factory carbs, The throttle responce & excelleration (part throttle) were outstanding, could'nt ask for a better carb, But once Eddy re-tooled an old design with there metering, They screwed up a good carb, If you can find an old AFB or AVS factory carb (theres many on here 4-sale) in good working condition your problems will misteriously disapear , that'll say it all about those Eddys.