Put in a new Bosch o2, spark plugs, and double checked the timing today. Been running the AC delco for the last 2 weeks with the wire crimped in one spot where I spliced extra wire in and then took it out. The Bosch seemed to reach easier than the other one.

Anyway, Friday the SES light came on for a minute (first time in about 2 weeks, 13). Tonight while driving for about an hour after changing all that stuff the SES came on 3 times. Code 13 again (Oxygen sensor signal stays lean during warm engine cruise)

Fuel pressure is holding now after putting in that different fuel rail. Temp sender is new.

Can anyone think of anything I might be missing that will cause this. I'm thinking I might take it to the Pontiac service center, have them hook it up to the scanner and see what they make of it.

Fuel mileage isn't that great either. It's gotten slightly better in the last month, but still isn't right.

I'm running out of ideas, other than hitting it and yelling at it.