I'm being told my injection pump is bad and needs to be rebuilt. Car is running bad (missing, not burning fuel well) and after it heats up the idle takes off, to 2200 when not in gear. Also have some kind of knocking in one of the cylinders. Burned veggie last summer while it was warm, but went back to diesel in cold weather. If bad, is the only pump that will fit, the same yr or will a range of yrs fit? mine is an 84 300d turbo, I've seen an 83 and an 85.

thanks,

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84 300 D Turbo, 222,000 and rolling, veggie most of the time.
91 350 SDL veggie wannabe