On to the injectors! On removing the air filter, I had a eureka moment, when I saw that one of the injectors had an obvious leak. Luckily it was one of the easy ones to get to. The pairs of injectors on either end have great access but the two in the middle look difficult. I changed the leaky one and one other and am waiting some more in the mail. The injectors themselves look fine, the delicate tips look just like the new ones. The fit of the new Oring and new insulator in the head is tight. I had to tap them in with a 15mm socket. The old ones came right out. The old seals were very brittle and mashed. It was nice to freshen up the seals but after a couple of starts, I don't think this is the cause of my stumbling start.

glenmore
1991 300CE
2000 C280
1990 LS400