jerky at low rpm

[wesinlessin]

swaped my old base engine and tranny out of my rsx for the type r k20 last year with your kpro ecu and it ran good for awhile, now it wants to studder and jerk when im drivin around town featherin the throttle and taking off from a stop, under 3000 rpms, but it runs fine over that. iv been using the tuned type s calabration, i just uploaded the type r eruo civic calabration and got a DTC:

primary heated oxygen sensor (primary HO2S) (Sensor 1) Heater circut malufunction

could this be the problem?
thanks for your time

[Spunkster]

You cannot use a PRA calibration. Load a PRB base calibration.

[wesinlessin]

iv been runing the prb type s factory calabration from the begining, i tryed the pra civic r setting to see if it would fix the problem because it is a type r engine but its still acting up