Alright I checked my code and switched out my 02 sensor and now it still does it. When I hit the gas the idle goes up and then all the way don until it wants to quit. about 100 rpms. I took the heat shield off of the manifold and there is a little crack in the manifold just above the O2 sensor. Do you think that is my problem, that it is letting too much air into the manifold. What do you think, could I use JB Weld to have a temporary fix for it. Thanks

 

Yea you need to get that crack fixed. I would have it professionally welded if you dont know how to do that... or get a new header.

 

Any suggestions on a header for that. I will probably go with a new aftermarket header. On my 97 civic is the cat part of the header and if so how and what new header set do I need for it. Thanks

 

Yeah, the crack would affect it...especially since it's close to the O2.