I got my 320 Back on the road, Runs Beautifully, however at idle, there's what I'd call a Lope, The rpms drop, then recover etc I was told my fuel Tubes were filthy which I'll clean them out, but should I look at more? I was thinking about doing a tuneup now that it's working again etc. Open to suggestions

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed