Being a GDI engine start with cleaning. These engines are notorious for carbon buildup on the intake valves. Techron and CRC make cleaners to address this problem.
Also clean the throttle body, mass air flow sensor and make sure the PCV system is clean and working properly.
If the problem is found to be carbon buildup on the intake valves installing an oil catch can may help reduce the buildup.
Thanks for the reply, will probably run some techron injector cleaner through the car, picked some up at walmart. I cleaned the tb and maf sensor a couple weeks ago, shortly after replacing the pedal assembly, and there was no change whatsoever in the hesitation. The tb was actually not nearly as dirty as I expected. This car had never had any issues with excess burning oil or oil blowback, and the air tube has had minimal oil in it. That being said, it was a little more than a half quart low last oil change, car does have quite a few miles on it though.
My wife told me this morning that the car has not had this issue again, at least not in the past several days. So this has me scratching my head as to what exactly was causing the hesitation and why no codes and what resolved the problem, why it went from every time you pressed the pedal to intermittent to no longer having an issue. When this problem was going on I could take the car out on the highway and stomp it from about 15-20 mph and it accelerated fine. Get on it from a dead stop and had the slight hesitation. Feather the gas past the hesitation point then stomp it and it was fine. This was why I initially thought the pedal or the throttle body had to be the problem. Please anyone chime in here on my thoughts/comments below, open to others thoughts.
Trash in the tank or dirty/clogged injectors would seem to me that there would be more performance/acceleration problems than just at the low rpm?
Bad gas, same as above, would likely not cause there to be only a low rpm hesitation? We typically run walmart gas, not had any past issues.
A tuneup issue, needing plugs or other ignition failure would likely throw a code, and again would likely not cause an issue only at low rpm's?
I don't think changing the pedal assembly would require the car to relearn anything, have read though that a tb replacement does require a relearn process?
About the only thing different I know of that I changed, was that I went to castrol edge with the last oil change from castrol magnatec. That should not have had any impact on performance.
When I had the tb off the car to clean it, there was a spot when working the butterfly that felt maybe just a little stiff, possible it was slightly hanging for just a fraction of a second and worked loose?
I still plan to get in the car sometime when my wife is not running in it and use my innova scanner to record live data.