The carbys are a very basic thing, but 30 years old. lack of idle is the most common. If you were to take the jets out and clean it, it would probably come good.
Autos have a different jet to manuals, so if the carby has been changed it could be lack of fuel causing your problems.
On the right hand side of the carby as you look at it from the front there is a 13mm bolt. Remove that and petrol will empty from the float chamber. Insert a small screwdriver into the hole and remove the jet insid. Clean or enlarge it a fraction with the smallest drill bit and the car will go heaps better.
It will cost you petrol if you go crazy, but a tiny bit is ok.
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