1999 Dodge Intrepid Engine losing power, stalling at stopli

I've had a check engine engine light triggered in my car for months now. It didnt seem to run bad so I ignored it (I know it wasnt a smart thing to do). Well a few weeks ago out of the blue it started losing power off and on when I stepped on the gas. I commute about 20 miles to work and it didnt start till about the final 3 miles. Figuring I was going to have the same trouble on the way back home I figured i'd give it a futile effort it's cheaper than a tow. It did'nt seems to act up much till about five miles before I got home. Wanting to know what I was dealing with and see if I could potentially fix it myself I got my hands on a diagnostic tool and the codes came back were p0432, p1391, and p0356. After searching a bit on it and trying to see if they were related to one another or if one paticular code was causing the bulk of my trouble I came to the conclusion I have no idea and was just making educated guesses from my limited knowledge of cars. Wondering if I was in over my head I considered whether or not to just take it somewhere but when I went to start it yesterday it would crank but not start. Any insights as to where to start and what my problem could be would be much appreciated