I've got a 2000 SSEI that I changed the spark plugs in about 2 months ago. That was a little trickier than I thought. I ended up REreplacing the plugs after 2 were bad. It ran like crap so I changed the plug wires. I took it out and gave it hell, ran ok. Now, when I go to get on it, either from a stop or on the highway, it kind of lunges (not really a miss, but might be). What is the symptom of a faulty O2 sensor? Could I have messed that up when I was struggling to get to the back spark plug?? My gaps and everything is ok with the wires. I know a flashing service engine soon light is not good, but it turns off after about 10 seconds. Any suggestions???

Check out this thread and see if you see any similarities.

http://www.bonnevilleclub.com/forum/...369&highlight=

The misfires are throwing the code and then clearing. Check your plug wires again with a continuity meter (ohm meter), even new ones can be bad. Make sure they are not routed near any metal especially the o2 sensor heat shield.

A bad O2 wouldnt cause a misfire, bad milage is the first sign of a dying O2 sensor...usually.

so the wires cannot be touching ANYTHING???

They can be seated in the their proper loom but no they should not be touching O2 sensor, manifold heat shield, the power steering res, or anything else back there. The fronts are much easier to manage