Firstly, a tank of bad gas is not going to ruin the fuel filter or the injectors. If you looked thro a service manual for "stalling", there are tons of reasons for stalling. If I were you, this is the following steps I would to tackle the problem,
1) Run the vehicle with a full gas of gas + Techron.
2) Its time you got the fuel filter replaced, in many of the newer vehicles the filters is inside the fuel tank. Though the user's manual details it is not to be replaced, I think it is a must to replace them atleast every 100K miles. This is a tricky job and I have done it on my maxima at 100K and the filter (inspite of 15% ethanol which is a good cleaner) was dirty as hell...
3) Get a injector service done.
4) Recheck ground for the starter, they can get corroded or become loose.
5) Also, check you EGR housing (valve and tube) it may be clogged!!!
6) Also clean any oil/acid residue between +ve and -ve terminals of the battery, current can jump with oil as a medium between terminals if there is residue on the battery.
7) Only then you go to the IACV, MAF etc which can cost you dearly..
Hope this helps.