Check for vaccuum leak, as mentioned above, first! There are a bunch of vaccuum hoses that all need to be checked for cracks and tight fit. I just replaced every one of mine! Idle will be exactly as you described if there is a vaccuum hose off. If not, adjust your idle according to the procedure in the shop manual. I'd agree, that after 6 years of sitting with gas in it, your carb needs a good cleaning and a rebuild. I also just did mine as it sat for 10 years and was totally clogged up with dried gas varnish. Carb kit was about $25. Good luck!
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1966 Town Hardtop - project car
1986 Mustang GT - original owner - daily driver
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