I am having some injector trouble on my '81 300D(non-turbo) and I am trying to decide whether I should buy new injectors or used injectors that have been pop tested.

If an injector pop tests within the acceptable range, does this mean the nozzle is good?

Can an injector have a good pop test with a bad nozzle?

Will a good pop test ensure proper spray pattern?

If I buy the used injectors that have been pop tested I may replace the nozzles as well.

Anybody have any advice/ideas to offer?

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1993 W124 300D
-297K on the clock as I type this.