96 Tacoma rpm drop while accelerating

I recently put a “new” 2.7 3rz jdm motor in the truck and have everything running well with no codes but when I accelerate near 2500 rpm’s it lags out and the rpm’s begin to fluctuate while still pushing higher slowly. I’ve replaced a myriad of components and basically my entire fuel system along with maf and tps but nothing seems to affect the lag so any ideas would be appreciated!

 

Manual or auto?

 

It’s a manual

 

I'd start simple, clean out the fuel tank and get some good fuel first, that could be an indication of something plugging up somewhere but since you redid all the components, it could be garbage fuel just keeps on gumming the works up.

 

It’s been doing with fresh fuel since the swap unfortunately

 

Any obd codes?

 

you gotta put the right 3rz wngine, you probbly put a 2001 in ther

 

No codes after I swapped my crankshaft sensor and injectors. Definitely possible I put a newer engine in. Was an n73 but the new one was slightly different