NG Warm Up Stumble

[Bob Gregory]

My recently revived B3 90q has been running better and
better (courtesy of a couple of bottles o' Redline
SL-1 cleaner + Amoco Premium).  However, at each cold
startup, after driving for a minute or so, the motor
stumbles badly for a couple of seconds, gets cured by
a couple of blips of the throttle, and then runs
stumble free until the next cold start.

Any ideas?  Almost seems like some dirt/rust/junk
somewhere in the fuel system settles out, gets
resuspended and then moves to an unoffensive spot. 
Clogged fuel filter?

TIA
Bob Gregory
88 90q

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