.I have a 74 450SEL with 258K miles. I've only owned it a short time. It's down on power. Sometimes it runs o.k.-other times it misses.. I'm going to check out the secondary ign. system-plug wires etc.
I've run Techron in the tank- but is there an easy way to tell how an injector is flowing? Is there a way to test or clean them thoroughly if I took them out? New ones are so expensive, I don't want to just go throw parts at the car. Junkyd. injectors are available for next to nothing, but still- how to determine if they are good?

Do a search and you will come by a post by Tomguy. It tells how he made a transformer? and used it to supply the injectors with power while they were immersed in carb cleaner. Do a search and I'm sure you'll see it. I'm not good with those kind of electronics so I don't understand how he did it.
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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I searched for Tomguy and couldn't find the article. Can anyone help with the link?

Maybe you don't need the link. I've cleaned injectors myself. What you DON'T want to do is apply direct 12v to the injector! That may fry it. It takes 1 to 3 volts to energize the injector. I typically increase the voltage until the injector opens. Besides a power generator I have access to an ultrasonic cleaner and a wide variety of solvents. A search of injector cleaning fluid has led me to believe they are mostly xylene based. I think the combination of ultrasonics and reverse flushing is what properly cleans an injector.

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95 E320 Cabriolet, 169K