Hello Scotty,
I have a 2004 Toyota Camry XLE 4cyl, I replaced the starter today...It did have a low idol...was idoling between 10-100rpm and the engine was shaking like crazy...Check engine was on but was showing the o2 sensor code which I didn't think was the problem...when I got home, my dad checked it out and tightened a tube (I don't know which one) which made the idoling back to the original 500 rpm. What else should I loon out for if the problem persists again or what else would it be?
The problem is gone. Just drive your car and be happy.

Sounds good, thank you
Problem is not occurring,
Check engine light is off, check the MAF sensor and it is clean, runs much better, thanks guys
I would clean the MAF sensor and throttle body if you have not done it yet.
Where is that located?