Car will crank, but won't start on 2000 Mercedes-Benz C230

I bought the car yesterday and bought the fuel pump it needed and it worked. It started up rough and lacked a LOT of power And lagged acceleration. I turned it off, moved a few fuses in the main fuse box and tried turning it on again to see if I had fixed the lagging accelerator and it would'nt start again...it just cranks. There is spark in the ignition coils and the fuel pump is new so, its not that. I really need help with this, thanks!

by in Odessa, TX on July 12, 2013
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