Update, update:
I spoke to soon. Drove again and engine light came on but never flashed. Checked codes and now have 0135, 0155, 0154, 1129, 0130. Could these issues with the upstream o2's vanish after running the seafoam?

 

Most likely not. Some of those codes say sensors are outside of normal range.

 

What does out of range mean?

 

It sounds to me like you have the O2 sensor wiring backwards. Perhaps when you had the engine out, you disconnected some of this harness, and possibly cut a wire along the way. These would trip the codes. Also, check your grounds.

As for Seafoam in the oil... I would never add anything to the oil that would dilute the viscosity.

 

Thats weird, I never disconnected either upstream o2 when I removed the motor.

 

who's 02 sensors did you use?

 

At this plug, the brown/pink wire should be 12 volts+ when engine is running or key in position 2. Same on all 4 O2 sensors. Be sure you have O2 plugged in and to correct plug. Could as mentioned above have crushed harness. Check fuse 2 in underhood box.

 

Cool, thanks Savannah Buzz. I bought 4 Bosch upper and lower o2's. Had a prob with codes ever since.

 

Which fuse is the #2 fuse? I cant find it in the rave or on the back of the fuse box cover. Also just curious if when the truck was warm I pulled the upper o2 plug apart would there be a difference right away in the way it ran? Or would it take a bit for it to start running rough and throw a code? Sometimes I can make it across town before the engine light comes on.

 

Here's pages from the RAVE, second from bottom in picture. But if it was blown most of engine management would be down. Some codes have to happen more than one time on different drive cycles before they pop back on.