In first gear and second gear, if I put the pedal to the floor, or anywhere in between, the RPMs climb as if I am barely pushing the gas. I have an injen cai and agency exhaust. didn't know if it is an intake or exhaust issue. but I checked it out a day later and it wasn't doing it. It feels like it slowed up a little at times, but it stopped for the most part, but I feel like it is still doing it a little. But the other day it felt like it was super bogged down and just wouldn't accelarte. Never seen this before. Any ideas?

 

check all of the connections on the intake. I've seen a leaky silicone connector make a car run like dog poop. Somtimes the hose clamps shift and cause the connection to pop apart. Especially if it is after the MAF sensor. Any unmetered air will cause the car to run awful.

 

It's a scion, don't expect power. Seriously....

 

clean your maf sensor,put some injector cleaner in and should be good to go

 

How many miles do you have? Auto or 5 speed? Sounds like a bad clutch and it's slipping on you.