Just bought an ODBII scanner and plugged it in:

These are the codes, some of which were in the system twice I wrote them ALL down in the order the scanner gave them.

P0300 Random / Multiple cylinder misfire. Excess emissions.
P0308 Cylinder 8 misfire
P0455 Evap emissions leak (large leak)
P0304 Cylinder 4 misfire
P0302 Cylinder 2 misfire
P1412 SAI system fault LH side- air delivery not reaching catalysts
P1415 SAI system fault RH side- air delivery not reaching catalysts
P1300 Random / Multiple cylinder misfire
P0308 Cylinder 8 misfire (duplicate)
P0304 Cylinder 4 misfire (duplicate)
P0306 Cylinder 6 misfire
P0302 Cylinder 2 misfire (duplicate)

The CEL came on after I replaced the wires. And yes, they are on correctly...

Is there a chance that some codes may have caused other ones? The interesting part is that the misfire is happening on all even cylinders... It is not noticeable unless you start up the truck about 2 hours after having driven it. So, not when it is totally cold, not when it is operating temperature either. It happens for 10 seconds right after start up, then disappears....

I am going to clear them, check all the hoses and see if the light comes on again. Any suggestions on what to look for are welcome!

Thanks!

 

Did you do new plugs when you did the wires?
Clean the filter to your SAI pump and see if that helps that.

 

I changed the plugs 2 weeks after the wires. The codes were on before the plugs were changed.

I just happened to look at the filter 2 days ago. It started to fall apart in my hands... It was clean though... I will need to buy a new one to replace the old one.

 

I would just do a wait and see type of thing.
Replace the SAI pump filter and then see if any codes come back.

 

That's kind of what I am thinking... I am trying to remember if I forgot to re-attach one of the hoses after I did the wires. I pulled it all apart again a day or two later and put it all back together. I may have "fixed" it by putting it all back together the second time.

We'll wait and see...

 

excuse my lack of knowledge but what is a SAI filter? S____ Air intake maybe?

 

Secondary
Air
Injection

It forces air into the exhaust to help the cats reach operating temp faster to help reduce exhaust emissions.
There is a foam filter on the intake for it that needs to be cleaned once in awhile.

 

glad I saw this thread...I probably need to clean mine as I didn't even know I had one haha