I may be able to help you! Change your camshaft position sensor. Yours will be the one on the back bank (bank 1) of the engine because the that's where 1, 3, and 5 are. The camshaft position sensor tells the engine what speed to fire the coils at, so when it's broken, you get misfires on all three cylinders on that bank.
Here's a link showing a picture of the sensor and where to find it. It is the easiest thing to replace once you find it. One bolt (10mm) and you're good.