It could be the O2 sensor, but my '88 GL behaved exactly the same way.
Everything checked, but I put in a new coil and it fired right up. There
was no evidence that coil was bad. Try swapping the coil with a known good
one. And do the same with the ECU.

JOHN
On Feb 27, 2015 5:54 PM, "Steven Johnson" <sjohnso2000@gmail.com> wrote:

> Agreeing with Mark,  O2 sensor.   Had similar issue with my
> 91 and a replacement O2 sensor fixed it.
>
> Steven
> 91 Westy
>
> On Fri, Feb 27, 2015 at 3:05 PM, mark drillock <mdrillock@cox.net> wrote:
>
> > This sounds like it could be related to the oxygen sensor circuit. When
> > the engine is cold the ECU ignores the O2 sensor. Once the engine warms
> >
> >
> > Mark
> >
> >>
> >>>
>