cold start problem

hi, i dont no if any of you will be able to help me. i have a 1990 nissan AD wagon. my car runs well. no noticeable driving problems. my issue is cold start. when i start the car it turns on and jerks like if its suffocating, and levels out on its own, morning time start is the most aggressive. i have an electronic throttle qg13 engine. i was told to try spraying a carburetor spray into the TB before starting, this in fact makes the car start very smooth. but its only for that one start, any other cold start for the day will result in a problem happening. i have no check engine light, no codes come up if i scan. any help?