It's beginning to slip into fall here, and I've discovered some starting issues in the morning when it's cool and damp out. A bit worse if it's been raining. (Runs fine from the get-go when it's dry. Also, rarely has trouble starting in the afternoon, no matter the weather.)

Typical damp morning: starts right up after a turn or two, idles well for ten seconds, then begins to lug. I can keep it from stalling if I just barely engage the accelerator, but if I give it too much (ie. trying to move), it'll bottom out and usually stall.

That is, until it's half-warmed up, then it's its usual charming self. I know my injectors need attention, but what else might be in play here?

1978, B21F