Hello All, new here so I thought I'd say hello and share a tip that maybe you already know about.

Denatured alcohol. I put a quart of it into my tank, had about 1.5 gal of existing gas.
It made it so I could pass and get back on the road (and stop the no registration tickets!) and give me some time to try figure out why my 2500 RPM CO output is so high (measured 4.9 before the denatured alcohol, and 0.5 after) I was passing on everything else, but the high RPM carbon was killing me before.

I know it wasn't a permanent fix, but it got me through emissions, now to figure out what's going on with my truck.
Now that the weather is hot, It's having some serious vapor lock type issues. But I'll probably post my symptoms / problems in another thread.