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Engine sputtering
i have a 94 gmc jimmy with the 4.3L v6 vortec with AOD . just recently one of my friends told me to put seafoam in threw my pcv line. even since then my truck has been acting like it is misfiring but i change the plugs, wires, cap and rotor and the pcv, and the oil. all this helped for bout 5 min then it started to do it again and the exhaust smells really weird and blows out black smoke at high rpm and at idle when i first start it and will turn the grass black after bout 5 min of idleing. when i drive the truck it sputters all the way threw first gear and whenever i make it downshift. and it backfires some what often.. i dont know if it could be timeing or what but it is gettting on my nerves... so any help would be great... thanks
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