http://www.youtube.com/watch?v=lFCjaz6zHfc

Have a look at the entire video. It's very informative.

 

Yes. I actually found this video 2 days prior. Good video.
Here is the latest. Just finished today. Pulled everything down and found the vac and fresh air purge reversed on the dist.(vac line to cap, purge to backside) Found boocoo corrosion inside on the bottom half of housing and most posts(and plastic at the posts) ate up from pitting. Cleaned all internals, reassembled w new cap and rotor, have new plugs all new wires. Also installed all new seals in the timing cover. Fired her up and guess what.....P302 AGAIN!!! What gives? I figured we are running and no other codes (cyl misfires) so cam sensor is good no need in a complete opti. Found so many issues with corrosion, vac etc had to be the cap. One issue currently is no vac reading at the fresh air intake, have it at the check on the intake side, have it at the filter (dist side) but not at the snorkel on the air man. ALL NEW hoses connections remade ALL NEW???????

 

So far we have changed plugs, plug wires, tested with a noid light the injector signal, swapped injectores (prob stayed with #2 cyl), replaced all vacuum hoses on the purge system, then pulled the opti and cleaned all corrosion inside and replaced cap and rotor. That didn't work next we purchased new opti and still have a P302. Anyone have any other suggestions PLEASE HELP. Compression/valve what else is there????