there are 3 in the front which are easy to get at, then there are 3 in the back under the intake manifold. they are a little difficult to change, because of the manifold secure bolts, but you should be able to get to them, once you remove the upper manifold.

Look on the intake manifold, it is 1-2-3-4-5-6.

Look on the intake manifold, it is 1-2-3-4-5-6.

They Are under the Intake manifold like on my 04 kia sedona, You have to removethe center part of the manifold.

you have 3 of them ,1in each exhaust manifold and 1 in one of the pipe leaving the exhaust manifold.

if the engine is a 2,4 liter, and if your replaceing the manifold gaskets, the manifold has 8 13mm bolts you need to remove, and also you need to drop the pipe, remove the 3 13mm bolts that connect to the rear pipe, then remove the four 15mm bolts that connect to the manifold, then you can remove the exhaust manifold, dont forget to remove the heat shield on top on the exhaust manifold 3 10mm bolts and one more item unplug the 02 sensor, you should be able to pull the manifold up and out of the way if your replaceing the gaskets, i just pulled the manifold off and up and bungy'd it up out of the way to clean the ports.