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Saab 93 Aero Sputtering after Seafoam

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I recently decided to treat my 2007 saab 93 aero 2.8t with seafoam. I had a can that was about 3/4 of the way full, poured 7 ounces into the crank case (an ounce for every quart of oil) and the rest (about a 1/4 of the bottle) into my half full tank of gas. It ran fine, I ran it for the 200 miles (over 2 days [I think this is where the problem was]) and changed the oil. It would sputter if I was trying to lightly accelerate (like from 50-60 in 5th @ 2,500rpm) but if I would accelerate hard it wouldn't sputter at all. Any ideas? I'm thinking fouled plugs causing a misfire, but It will continue to sputter indefinitely if you don't either let off or shift down which is weird. 

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