Really quick question. How much should I pay for a junk yard injection pump? I know for sure that someone messed with the individual element timing on the pump and that it could be the source of some of my problems.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800