964 running on 5 ?
 

Hi,

when the engine is hot (city running with outside temp over 80F),
I loose cyl no 1.

Where do I check first?
thanks.

I would guess that it would be fuel related since the car has dual distributers. Seems unlikely that both plugs would lose spark on cyl #1. Unless you have been running on a broken belt without knowing it and the #1 on the primary is cutting out.