500 SL misses

[el Miguel]

My 1984 Euro 500 starts right up, idles fine and runs fine until it warms up and then I feel an engine miss. Kinda bogs down when pressing the accelerator. It is running rich also. Smells of unburned fuel. My indie has retired. Where would you start to trouble shoot? Seems like this started when I added injector cleaner. Thanks.
Mike

[el Miguel]

I changed the spark plugs. That helped.