Hi Cosmo!
Since the TR3/early 4's don,t have the temp compensator of stromberg CD2's when
malfunction also causes a 2000rpm 'idle'; the most likely culprits are as said
the sticky piston or mis-sync-ed carb throttle shafts.
On the 1st- clean the piston, the bore, the dashpot guide (top of piston) as
varnish can build up; but also clean the bushing in the carb dome top. Also-
make sure the dome is concentric- pistons can stick if the dome is 'warped'-
and the warp can be misalignment. Racers used to run the dashpits dry in the
60's I was told.
Make sure the 'spring clamps' between / connecting the throttle shafts are not
cracked or not tightening- or slipping.
Have had both issues on my TR4 and jensen healey/GT (lotus 907's) , triple carb
6 cyl Jag E's,and 4carb jag V-12
Sherman
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