alright, I have a 1977 mercedes 300d, bought it about 3 years ago, and as anyone who's every driven one of these, it's speed is about as leisurely as a man with an appointment for colonic irrigation. But recently it has been accelerating up to freeway speeds with more difficulty than normal accelerating up to a reasonable speed. Have had one filter replaced recently. It runs off of dino-diesel, but I am thinking that it may be a clogged fuel line or the filter which wasn't replaced recently. I was thinking it could also be a fungus problem. I need to figure out what the problem is without completely dismantling the car as I can't afford to have it not running. I would appreciate anyone able to shed a little light on the situation. Additionally I was thinking of trying out a load of fuel with a cetane boost as it is probably designed to run on European diesel which has a higher cetane content, bad idea?