To max wedge,05 impala is jumpy when cold

[2005chevimpala]

To Max,I have an 05 impala 3.4,car has 100'km's,in last 2 years and just 6 months ago i have had the pressure control soilinied replaced because the car was banging and jumpy when she hit 60 km's,this is the 3rd pcs thay replaced that fixed the problem,a month ago she started doing it again but now when the car sits overnight and you drive when its cold,when you start off from a stop it's like she is nudging somwhat like she's not getting enough fuel,so i take to the dealer they scan the tranny under warranty and they fing an op code,it saidcode p 1819 which is the manual shift detent lever and park pawl actuator and saftey neutral switch,so the transmission shop that the work was sub let out to took the tranny right out and replaced that part,when i piced my car up they said she was fine,this morning the car is doing it again but since driving for an hour she is find,is it possible its a fuel problem or something that won't put out a code,there are no codes stored anywhere to turn on the light,could it be a fuel filter that i have not repalced yet and is cloogged a bit like its starving for fuel when starting off,the engine runs great with no misses or anything when cold or hot,you have any suggestions,thanks,maybe bad spark plugs?,need some input with this problem,thanks guys,could it be a bad map sensor,fuel pressure,when i give it more gas she starts off fine,could it be a bad injector?hesitates when staring off from a start but is fine when warmed up and driving for an hour or so