{Chrysler 300} carburetors / storage

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

so what is this stuff ?

 looks  like coffee grounds , clogged the carter jets around mixture rods . Pieces magnified have slight rotary appearance like ? tiny rotelli ? pasta . 

symptom : idle screws ineffective , as fuel to idle circuit flows through main jets, rods are down at idle Result : it stalls the minute you close throttle , but long before that , idle screws seem to “ make no difference “ don’t adjust right . 
Like most of you , i have a lot of cars in storage , I hope this is not going on in all of them . 
There is a filter right before this carb , stock mopar metal one . First thoughts were some kind of corrosion inside short stock line after fitter , or filter parts or can dissolved inside by ethanol ? 
Huge hassle ending with tow truck on exit ramp as this lets you get 10 miles from home and car stops for good, after attempting to “ clean it out” . Ran  great on highway 90 mph ( rods lift out then) . You slow for exit ramp it dies for good . happens to be a 2 bbl 318 restored truck , BBD carb but identical functionally to front two of wcfb or afb 4 bbl. Truck has plastic gas tank , stainless mesh filter added there 
This carb was rebuilt 5 years back  by a large canadian rebuilder , they left out a check ball under accelerator pump . Floats set lightly low . two upper body gaskets on top of each other not sure why but left that . 
Makes me think do it yourself always . Buying rebuilt carb off the shelf a crap shoot , depends on guy who did it 
Main jets impossible to get out of body, the  screw slot previously mangled, and corroded in place ?  . Tried heat etc . Then realized critical jet sizing bore is 1/8” below screwdriver slot , nothing can go wrong there and you can still clean it gently — so heads up , leave alone if jet does not come out easily . 
fyi , this problem matters … 
tip 1 Thinking about it , run car dry every time you put away for more than 30 days?
tip  2, don’t try to “clear it out “ on highway if idle system not working right . 

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