Cleaned the contacts in the TPS and that has all but cured the "cough". I can get the car to do it "on purpose, by fethering the throttle at 40mph in 4th for very gentle acceleration, but it's a thousand times better, plus the car generally runs more smoothly.
C1800, I partially followed your instructions for idle speed. I was too scared to dismantle the TPS. Those wires look fragile! Plus the head of the lower screw which you loosen to allow the unit to be revolved had been damaged, so I didn't want to remove it without having a new one handy. I had previously used the stop screw to adjust the idle speed after fitting electronic ignition (red face), so I backed it right off and used the correct adjuster.
Thank you, thank you, thank you.
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