Have not checked the compression. I don't have a machine. It actually ran fine today and only stumbled a few times. Just as a precautionary measure I had the battery, alternator, and VR/diode tested yesterday and everything was fine. One thing that I would like to add is that I noticed that when it stumbles some the instrument cluster light dims a bit, but just on a rough stumble. Also, when the car stumbles or idles rough there is no change in my actual RPM tach, it remains at a solid 500-750 rpm. Also, my check engine light is on now which gives me code 11, air injection system. I don't know what that means, but I have been getting a code 11 on and off for several years now. Thank you all for your replies in helping me troubleshoot this problem, I really appreciate it. It just sucks that I just got a new/used transmission put in in Dec. and pretty much every starting/charging/ignition/emissions component is new and I'm having this problem. Is it possible the additive I put in messed something up? I'm almost positive this problem was not present until I added Rislone Compression Repair with Ring Seal.

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1990 190E 3.0L