Hello everybody.

My wagon has had this problem for a while, I have not been able to figure it out. I few months ago it would make a ugly noise while cranking the engine when cold and lacked the usual power. I did a tune up, it seemed to improve, now when starting it will go on but at a lower RPM than normal, so it has problems to stay running.It still lacks the normal power and barely passed the california smog inspection. It seems to be running a little rich. I am considering replacing the O2 sensor and cat converter, but before doing that I thought about checking with you guys first.

Well, if you can give any hints/ideas of what could be wrong, i will certainly appreciate it. Thanks.