Hi Scotty and everyone,

Thanks for all of your work. I am still working on my Hyundai Santa Fe 2008 with a 2.7L V6 engine (170000 miles). I am a first-time driver and I might ask stupid questions.

It's idling poor, even shaking and halting sometimes (the effect is less prominent if I put it into neutral). It's hesitating and has less power. Also, it's giving P2187 and P2189 lean codes.

I have done so far:

- Replaced the spark plugs

- Replaced PCV valve

- Replaced intake manifold gasket

- Cleaned the MAF sensor and throttle body

- Did the smoke test for vacuum leaks

- Checked purge solenoid valve (only manually)

- I did fuel injector cleaning 8000 miles ago (at the local store) {and the problem started after that}

Live data shows over 20% long and short term fuel trims which decrease with increased RPM. I suspected a vacuum leak but couldn't detect it by smoke check or carb. cleaner spraying.

There is no misfire from the OBD scan. The engine works at 194F

I haven't tested the fuel pump yet. 

My questions:

- Does Hyundai Santa Fe 2008 with a 2.7L V6 engine has EGR valve and how can I locate it? I read a bad EGR valve can be the cause of poor idle but couldn't locate it in my car. I found EGR vacuum solenoid, does it function in place of the EGR valve?

- Does Hyundai Santa Fe 2008 with a 2.7L V6 engine has Idle air control valve and how to locate it? I read a bad IAC valve can be the cause of poor idle but I couldn't locate it?

- I found info that a bad purge solenoid valve can be a reason for lean codes and my car failed to start a couple of times after filling the gas tank. But when I check manually (blow into the valve) purge solenoid it seemed ok. Should I replace it anyway? and does bad purge solenoid valve result in poor idle, loss of power, and halting?

- Should I change spark plug wires or o2 sensors?

Best regards

Aibek