Tacoma misfire

I have a 2019 trd OR and im having an issue with a misfire. I changed plugs and coils and the pcv valve. Its helped a little but I can still feel a bit of a miss. Any help would be greatly appreciated.

 

Obvious first question, is it throwing any codes?

 

No codes

 

Do a compression test and a leak-down test.

 

Any codes? If not, try cleaning the MAF, replacing the engine air filter, and cleaning the engine bay to keep it cooler. Not sure if you've tried any of those but cheap and quick if not. Good luck.

 

stop driving it till you figure it out or you will be back here asking about p0420 p0430 codes......

 

It wouldn’t hurt to try one tank of higher octane gas if you are not already using premium.

 

Most likely you are dealing with the torque converter behavior. Any serious misfires would illuminate CEL.
To be sure you have a misfire, get a cheap obdII phone app.

 

I put higher octane gas and Lucas fuel treatment. It seems to have solved the issue. I noticed that #3 spark plug seems to like to come loose as well.

 

Its goes away the faster I drive.

 

Do you feel misfire consistently at the idle?
Then have before mentioned leakdown/compression tests. Misfire at idle is the one of the symptoms of burnt exhaust valve(s) (P11 codes)

 

No misfire during idle

 

My truck ('16) has always had a slight stumble under light acceleration when using the lowest octane gas. Very common.

 

Pull your airbox off, tube and all and check for any oil in it in case the PCV valve was allowing oil in it. Happened to mine. I deleted my aftermarket intake as well and it ran better.

 

This is a pretty violent miss/ shake.feels underpowered and sluggish.