What would cause my 1994 Dodge Caravan to run extremely rough?

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My 1994 dodge caravan started to misfire, idle low, have an extreme smell of gas come from it, aa well as blow blue smoke. The engine actually vibrates quite a bit when running. When I looked at and cleaned the fuel injectors the engine all of a sudden started to idle extremely high. What would cause this as well? The problem first started to occur once in awhile when it rained and then it corrected itself. 5 days ago it rained really hard and ever since then has not corrected itself and has gotten worse.