When you start the car for the first time after it has been sitting for a while, it fires right up but has an intermittent miss at idle that clears up after a few seconds. It doesnt seem like it misses at any rpms above idle. I initially assumed it was a leaky injector losing prime, but that would still miss at any rpm. MAybe a bad glowplug? My glowplug light does not come on, but the car fires very easily. Ideas?

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1983 300SD.....169,000 miles but quit counting a few owners and unknown years ago!