Howdy all, first day with the list. I'm having a weird problem with my
'85 westy. Most of the time runs great but sometimes after the engine is
good and warm and I need to sit at a long stop light (approx. 2 minutes)
there is little or no acceleration until I am almost through the
intersection. There is no back firing, sputtering or other telltale sign
of a problem. If I stop at the the next light for only a few seconds I
can take off with no problem but once it happens, it happens at every
long light. I have replaced the O2 sensor but the problem is still
happening.

Where do I start looking?