An injector that is stuck open could be causing your problem. With the engine at idle, crack the lines loose one at a time to see which one does not make much, if any, difference.
The injector that makes the least difference is most likely NOT the one that is bad. If you have an injector stuck open the cylinder that it is in is most likely firing, but it dumps all the residual pressure out of the injection pump head so that at idle all the fuel for the next cylinder in the firing order just builds the pressure back up so there is little fuel left to crack open the injector. At higher speeds there is more fuel injected so the miss will go away but that cylinder will still be low on fuel. Meanwhile the open injector will be dumping so much fuel that you can end up with a lot of smoke.
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