Tugs back and forth when downshifting ?

[D111]

Yes it returns to the idle that is approximately 950-1000 RPMs But then after about 30 seconds of idling it'll work its way down to about 650-700.
I have dual Firm Springs And does not move any further with my finger.

I'm at a loss for both the conditions, maybe a vacuum leak?

[carmine]

Take off the distributor cap and rotor and check the centrifical advance weights
and springs.
They may be all rusty causing them to be stiff in there movement.
If so remove the springs then lift out the weights and sand them clean then lubricate them and re-install.

[D111]

I just spoke with
quickfuel they recommend changing my primary jets to 72 from 70.

He feels it might be a lean condition on the low end causing both
situations.

Just waiting to hear back from Brent from B2 motorsports to find out if those jets were already changed, hope it's easy to do Don't really feel like ripping apart the Carburetor.

[Gaz64]

The slow return to idle is typical of a semi-race style carb AND camshaft.

Your idle circuit is a tad lean for idle/ progression conditions.

The idle feed restrictions need to be a little bit larger.

Have you got access to a wideband O2 sensor?