Engine Performance problem
1994 Other Oldsmobile Models 6 cyl Two Wheel Drive Automatic 141377 miles
i own a 94 acheivea and it has started to act like it is wanting to stall when I go between 45 and 55 so I mass the gas all the way down and it blows out black smoke. Well I changed the spark plugs and just had a tune up a few months ago. Someone said it could have been water in the gas or the fuel filter. But it only blows out black smoke when I dog it so it will not cut off. And now I seen where it left a black mark on the ground like oiil. What could it be? And how much would it cost to fix it? I don't want to brake down with my little girl I am a single mom.