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Sounds like needs a tune up, New spark plugs-wires, could be running on 5 cil. put a new fuel filter on, this helps sometimes. Buy gas treatment at Autozone, you may have water in your gas, run all the gas out and buy gas at a different place than before. Try and get 91 oct. better fuel may help.
ethanol gas problem. add a can of SEAFOAM to tank of Premium gas. change fuel filter after 100 miles. then add SEAFOAM 3-5000 miles to keep fuel line/system;emissions, and valves clean of ethanol goop and water which is created by this awful ethanol mixture.
there is a vapour purge line from the tank to a charcoal cannister. The line& cannister has been contaminated with liquid gas. When the engine attempts a normal purge from cannister it gets loaded with raw gas, causing rough running and cherck engine light. Replace cannister. Never over fill gas tank, especially on hot sunny days
have you checked, cady, fuel tank, is it getting the right amount of gas and air? plugs and wires, go with general mantinence first then step up. i have a 85 s10 blazer that was a lemon off the lot but has over 300000 on it and it has the same prob i fix it tempurary by flipping the lid on the breather upside down so it gets more air