Someone please help. I bought this truck in October and fixed a few miner leaks on it. I used it for work for about 6 months and it ran like a top. about 3 weeks ago we went camping in it. no rough or hard driving at all but it threw on a check engine light. as I would drive it would start flashing. it has an aftermarket air box and a k&n air filter. so I thought maybe time for a cleaning I did just like the bottle says and cleaned it. it then proceeded to smoke a little, which I figured was normal. I drove it home from my parents house and it started to misfire. I paid a guy 350 dollars to fix it and he replaced the maf sensor I believe and told me it was running good for him... long story short I have replaced plugs, wires, 1 coil, throttle position sensor, egr vacuum synchronizer, and egr valve. I started it up and it is shaking incredibly bad and wont barely move, it is still misfiring and but I have a feeling it isn't the one coil I didn't replace... but at this point I am at a loss.
could a dying battery cause this? all plugs are tight and all wires properly installed... what do I do I need this truck to run? when I plugged it in it gave me 15 codes but I do think that some are due to a dying battery. some were wheel speed sensors but it had misfire on 3 and bad egr valve. please, please, please, someone help.

 

First thing you can do is give the codes accurately.
That's why they are set so we know what's going on.
Good luck.