I have the same deal on my 04 300 with an RB modded carb. Started with a 45 pilot jet, no idle no matter what I did. Went to a 42, would barely idle sometimes. Went to a 40 and now it will idle very low, but the spring is still nearly bound.
The mixture screw does not seem to affect the idle, if at all. Off idle, yes, but idle no.
I'm trying to decide whether I should go to a 38 pilot or perhaps a #8 cutaway on the slide.
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