Hi All,

I bought my '84 300SD about 8 weeks ago and have of course examined the service records very closely. Over the past 6-7 years, the car only had about 5,000 miles put on it-so obviously there was a lot of time spent sitting in a garage.

In the past 2 weeks, I have noticed she idles a tad rough and seems to smoke a bit more than usual. I am suspecting this may have something to do with clogged injectors. Thanks to the great website by Thomaspin, I have mustered the courage to pull and clean the 5 injectors over this coming weekend.

Let me ask a few things and any additional info you want to add, please feel free:

1. Is it possible for injectors to get clogged easily when a car has sat for a long time and then begins to run regularly?

2. Are clogged injectors a likely culprit when experiencing rough idle and a little excess smoke?

3. Finally, there are 2 types of heat shields available when you replace them: 7mm and 10mm. Which one should I buy? What are the differences? Any insight here would be greatly appreciated.

Thanks,
Bud