Engine hesitation

I am new on the forum but I know my problem is not.
Have 2004 tacoma V 6 with a bad hesitation problem after it warms up. Prior to warm up it runs fine.
The CEL came on last week. Took it to Pep Boys. Code indicated # 4 plug had problem. Checked pulg & found it was not tightened correctly. Fixed it. Truck ran better.
Few days later hesitation began again.
I have changed the fuel filter & plugs. CEL is on again. I will take it back to P B but wondered if any of you can help.

 

clean the MAF sensor...

 

Thanks Mike. I did that but there is no change. It really wasnt dirty but I used MAF cleaner & Q tips.
I suppose next is the 02 sensor. I will take it to have the code read & go from there.

 

Pep Boys checked code & says its a # 4 cylinder misfire. They want 90 bucks to tell me exactly what that means.
I just put in new plugs. Could this be the plug wires? How do I check them?
Or could this be something else that you know of?
Thanks for any help.

 

I hope when you were cleaning your MAF you didnt touch the little wires with the q-tips! That would be verry bad!
And It could possible the wires are bad, I would change them first. Then go from there. I cant remember which side #4 is on. But if it the coil pack side, I know that those can fail or go bad too. Just throughin things out there! Hope you find the problem man!

 

I think I found & fixed the problem today. Changed the # 4 plug wire. Unhooked battery to re-set CEL.
Took truck for test drive for about 10 miles. Hesitation is gone. Engine runs as normal again.
Thanks EverTaco for the tip.