I'm going to summarize whats been told to you and try to add a little bit.
First of all, its been suggested to you that you unplug your rear o2 sensor as this might be the cause. The 02 sensors are located before and after the catalytic converter.
If you look underneath your front end you will see the header and catalytic converter connected right behind that. The one just behind the catalytic converter is the rear o2 sensor. It will have a plug which you can just pull off. If its been changed with a universal you might have to cut the wire, as you generally have to to hardwire them depending on the brand.
The front o2 sensor should be somewhere before the catalytic converter. Its most likely right under the header or close to there.
As far as the other suggestions. It looks like some think you should check your maf, and/or replace it.
The maf is located in the engine bay, its connected to the intake tubing and has a plug connected to it. I'm sure finding a replacement is easy just need to check around. I believe the 2g turbo eclipse/talon maf will also be a direct replacement.
Its possible even if you did the timing belt and components that your timing is off. It can't hurt to check. I always check timing after a few hundred miles of doing anything requiring timing related components.
I personally believe it could be the maf or the o2 sensor. If it was me. I would replace both o2 sensors with new ones. I would also replace the maf with a known working one.
Everyone who has responded to you thinks these are your issues. The items are pretty clear cut as to where they are located.
Let us know how it goes!
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