2010 Trail 5th gen 4runner p0304 code

Hey guys!

Went hunting and got the p0304 code on my 2010 trail with only 64,000 miles. I'll give you a series of events for reference

1) Drove 200 miles
2) filled up half a tank at a gas station
3) drove 20 miles to hunting spot on dirt road
4) sat over night
5) shot deer, hiked back to my truck and the check engine light was flashing, multiterran select flashing, and vsc light on. Rode rough.
6) packed up everything and drove 200 miles home
7) filled up half tank gas today to see if it was bad gas that did it
8) read codes and found it was p0304

Where should I start? I'm a grad student so don't have money to throw around

Code says 1) weak/missing spark 2) plugged fuel injector 3) engine mechanical fault 4) large vacuum leak specific to cylinder

Don't think it would be spark plug due to the low miles and the truck does shake. Thankfully I ride my bike to school so it can sit for awhile until Christmas break

Thanks for any help

 

I did switch coil #4 and #2 and the code still reads p0304 and did not follow the cylinder so can say it is not the ignition coil.

What next?