I checked the plugs today and they were jet black. After the headers went in the car lost power, it won't spin them on a 1 - 2 shift anymore . I was wondering what the problem might be? The bolts are tight and there dosn't seem to be any leaks although i am useing cheap paper gaskets.

 

Check the O2s

 

How do you check them? You mean remove them?

 

If you have a good bit of miles on them, or you don't know how old they are then you should replace them. Go with the stock ones. Around $100 for the two you need. I found the ones I'm getting at www.lakechevrolet.com or I'll try to get ahold of Jason Cromer.

 

I think i'm going to do that, first though i'm gonna try to just disconnect them and see if that helps out at all. I was wondering though, when I had the exhaust tack welded together I had them make O2 extensions. The extensions were from the O2's to the PCM, not an extension of the pcm wires. Could that cause it?

 

o2 sensors are 70+shipping at gmpartsdirect.com
shipping from them is a little expensive, so it'll probably be about 15 bucks.

p/n 25312184

edit: that's 70 for both of them

 

$85 shipped isn't bad at all. That is the two in the y pipe area right? I might just order mine from them becaue one day my Jet-Hot macs will get here. And if the extensions were not properly installed YES that could cause it. Absolutley.

 

fuel pressure regulator could be bad, as well.

 

So for now do I need to clean the plugs? Or will it go away on its own when it leans out. I've heard carbon plugs can cause a misfire.

 

If they are out then it wouldn't hurt to clean them, but if not I would think a good ol Seafoam treatment would help set things right when you have located the prob.