this is probably not the right place to post this but im desperate,after changing my fuel injection pump.the surf is still chucking out black smoke and missfiring.the injectors were tested and all are ok,the egr valve has been blocked off and the comppression was checked and all four cylinders are ok.it starts and runs fine until you rev it.now im fed up and am just about to get the gas axe to it. does anyone have a clue what to look at next.is it just a sender breaking down or a split hose.any help greatly appreciated

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