1995 Isuzu Rodeo Question Hesitation/Low Power around 2k-2.5

I did start a post a few months ago, but I let it go as it seemed it went away after a completely new exhaust was put on.

Here is the issue:
Around 2-2.5k RPMs the engine seems to "choke/hesitate" while driving which in turn causes me to downshift to get past this pesky RPM range. It has harly no power during this range. To me it seems like it's getting a bad fuel ratio in some fashion. While in park I can step on the gas and it seems to rev up just fine past this range fine. Also at idle, it runs really rough at times. When the engine is cold, it seems to run better.

Sometimes, maybe like 10% of the time. The truck runs fine even when warm. After I put the Rodeo's new exhaust on back in Sept, it seemed to run great and I figured poor back pressure messed up the fuel mixture. However, it's come back with a passion! Maybe because of the cold weather in New YorK?

Also, if I put the truck in gear and hold the brake, it cannot even come close to breaking loose (pressing the gas hard) and spinning in the gravel drive-way. Not sure if that matters as all my other vehicles could break loose more or less.

It's gotta be a bad sensor somewhere. I also replaced the vacuum lines recently too.