sorry fellaz but this aint a diesle related question...wondering if you guys can help me out...

my dad has a 300E 86' and he just changed the sparks, wires, and dis.cap about 3000 miles ago. When he went to the shop to get it done, the mechanic told him his ball bearings on some pulley for the serpentine belt has gone bad, but it was still driveable.


now that i'm driving it for a while i'm experiencing "clatter" in respects to the RPMS.. everytime I accelerate...it sounds like a diesle. Accerleration is extremely poor...doesnt feel like a 6 inside...more like a 6 diesle and sometimes on cold days it will surge a little whenever i try to floor the gas pedal. After i reach about 35mph..the "clattering goes away". I just checked the serpentine belt... and the suckers about to snap because theres so many cracks on the belt. On top of that, i just filled the gas tank up (91octane) and i estimated about 110-125miles of driving and the gauge is down to a little less that a 1/4 of a tank left.

what do you think's wrong with the car....i'm assuming many things play a factor in.....i appreciate your responses.