OK, so here's an update. Got and installed the new injector on cyl #3. The old injector was clogged for sure. Car runs great, and idles good. I can still detect just a tiny bit of roughness in the idle. I will run a few bottles of injector cleaner through the engine, and if it still exists after that, maybe start replacing the remaining injectors a couple at a time. (while I had the thing apart, I went over all the vac lines to make sure they were in good shape so I doubt it's a vac leak) Now the car feels like you have a V8 under the hood. LOTS more power than it had before.

Unfortunately, now that I have all that power back, I'm noticing a very hard shift into overdrive. Every time it shifts into high gear there is a nasty thud, unless your foot is FIRMLY in the throttle, then the shift is fine. I just had the trans checked out and serviced before the head was removed. The trans shop gave it a clean bill of health so I don't think this is a trans issue.

Any ideas here?

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Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey