Was cruising around tonight and about 5mins into the drive I started feeling this hesitation as I would accelerate from a stop. I can also see on the tach that it would bounce/stutter as well. This would happen between 1k-4k on a MT. Soon after I got a CEL which in a way took my worries away thinking I would find out when I get home. Well got home hooked up my car to OSIRIS to read DTC's and got a P0172 which is a Rich Bank 1 issue but left me thinking even more....

Would this be a tune issue? Can someone chime in please.

Just to note, I have the upgraded Uprev Maf.

 

Have you checked for fouled spark plugs?

 

Just installed new one step colder plugs along with the new maf.