Ca18det Hesitating

[athomas08]

I have recently replaced my Headgasket, did a full timing belt service, and got a 3-angle valve job done on my ca. The car was running really well after completing the work and now I am having a problem. The car is idling a little erratically, and at about 10% throttle I am getting a hesitation from the throttle response. At full throttle or even heavy throttle, the car is running really well. The problem is only when I am maintaining lower speeds in whatever gear I am in (like freeway speed in 5th or neighborhood speed in 2nd).

I am getting a different o2 readout from my Apex Turbo Timer- it used to read .36 at idle and now it is reading like 2.xx. I recently installed a stereo in my car, it didnt have one before, and a lot of different electronics started working again (like my dash clock, the overhead lamp, door chime). I dont think this has anything to do with the problem but I am just providing as much information as possible.

Thank you, any help is appreciated.

[Jiggyfry]

Does it always hesitate, any difference when the engine is hot or cold?

How long did it run well following the repairs?

Checked the plugs yet?

[athomas08]

I just changed my plugs. I am thinking it is any of the following:Vacuum LeakDirty MAFOr something that controls the idle- either the TPS or the Air Idle Control Valve

Let me know if anything like this sounds familiar.

Thanks