Last week when I started the car (300D) on cold mornings, it started fine but ran rough for about 30 seconds. Then, a few days later, it was very difficult to start when cold. I metered the GP's and found two bad ones. I'm sure it was just one at first, causing the rough running on start up. Then, with two bad, it was just too much to expect it to start cold. I found the Bosch 80006 GP's at Autozone for $9.99 each and replaced them all. Starts perfectly now.

The bad ones were #4 and #5. # 5 is a PITA to get to. Four is only a little better. The others weren't too bad. Took a couple of hours the first time. Next time I will remove the injector lines and get a ratcheting 12mm wrench. I think that will cut my time to less than an hour.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer