Joel,
Thanks for your input, I'm pretty sure it's not the fuel pressure regulator as I have replaced it recently. There is no blue/gray  smoke and the exhaust doesn't smell like it's running rich either. I think I will put in a new O2 sensor, or at least a different one that I have. As for the injectors I couldn't say that they are good nor bad. And I have a new Cat on the way as well as a new fuel filler cap too. And the timing is at 7+ - ABTC. What's all the chatter about running at 5?

Joel Walker <jwalker17@earthlink.net> wrote:
> 15 MPH Test
> HC 221 Max allowed 131
> CO 0.87 Max allowed 0.82
> NO 1970 Max 1085
>
> 25 MPH Test
> HC 193 Max allowed103
> CO 0.77 Max 1.10
> NO 1577 Max 1120

dunno fer sure, but it looks to me like you're running too rich.
which could be the oxygen sensor, the aux air regulator, and/or the
fuel pressure regulator, or just old leaking injectors.

but a new cat wouldn't hurt ... i just don't think it's gonna solve
this problem.

good luck!
joel