replace all filters (primary and secondary fuel filters too), clean line that comes out from the back of the intake, adjust valves. this is just the beginning. do a search and u should find a lot of helpful tips

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05