hesitation 1500-2000 rpm

[towncarblue3]

i recently had a few issues with my 2002 pathfinder.

p1446 - rat ate a vacuum hose that is on top of the intake - fixed
p0122,p1705 - replaced tps sensor , not an issue anymore. no codes
p0452 - found a gas leak around the fuel filter,
the fuel pump relay was bad , the fuel pump kept pumping until the battery died.

i had extremely high idle, when i replaced the mass airflow sensor, idle went back to normal {750 rpm}.

NOW... when i rev the engine{park} , at 1500 rpm it starts to stutter/hesitate
it levels itself out at 2000 rpm and revs fine at higher rpm's, no codes. between 1500 rpm and 2000 rpm is the issue. i havent driven the car yet.
i dont know what to look for ??? what can check for ??