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This reminds me of the time I drove my MGB home to Alabama after it was stored at my FIL house in AZ for two years while we was on Guam. It kept leaning out at hiway speeds and I could smooth it out with the manual choke. So at each gas stop I would richen the carbs up a bit (dual SU) but soon the car was way too rich at idle. Tried everything rebuilt the carbs and set the mixture at idle, replaced the cylinder head (had a small crack in the leaking coolant). I was at my wits end then I tried to pull the hose off the brake booster and felt a rough spot. Sure enough is was a cracked vacuum hose. It is always the last thing you try so strive for doing that thing first!
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