If you car is an 86 it could be just gummed up from age. Does it have a TBI in it? if so I would take the air cleaner off start it up and spray Gumout down the throtle body, sometimes this will clean the sensors off. If that does not work I would buy a bottle of Chevron Techron, it comes in a black bottle and cost about $6.00. Add the Techron when you are about down to 1/4 tank and fill up, it may take a day or two before you notice any difference - don't laugh this stuff really works. If both the Gumout and Techron don't work at least you won't be out more than $10.00 and then you can go for the more costly repairs.
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