just wondering if any one can give me an idea where to start looking for a fault i have on m 2008 300 cdr, there is no codes or warning lights showing on dash, it seems to be missing between 1.5k and 2.5k under load, then pulls like a train only to almost cut out and then start pulling hard again, its starts ok and idles ok, it's a high miler and i have just purchased it for a bit of a project and run about, it runs fine if you don't ask it for power, any help would be grateful, thanks in advance, hoping its just a fuel filter or along those lines