[Healeys] problem keeping Healey running

[frankyow_99 at yahoo.com (frank yow)]

Woke BT7 up from winter sleep about two weeks ago, started fine, took out for a 
spin, about 45 minutes into drive began to run poorly, then stopped in heavy 
traffic, got it started, went home without dropping to idle, running very poor. 
Next morning repeated the same, same behaviour. Have checked ignition 
(Pertronix), plugs and coil fine, a little sediment in carb bowls, what could 
it be that develops after some time under power, welcome advice. TIA, Frank Yow