My 93 300D 2.5T feels like it is missing under very light throttle in top gear. I fist noticed this 6 months or so ago, but it has gotten much more noticeable the past week or so. Otherwise, the engine is fine....starts smooth, idles smooth, no miss under acceleration or normal cruising. It only seems to happen if I'm applying very light throttle such at lowers speeds in higher (i.e., low rpm).

I did a diesel purge in the past 9 months, run B20 most every tank, and have changed both filters. I don't think it a fuel starvation issue.

Could a stretched timing chain cause the symptoms (160,000 on original chain)? Any other thoughts or suggestions?