Engine starting rough
 

So i got my check engine light diagnosed about 2 weeks ago and turns out my ect sensor was not connected properly so the plug it in, the light goes away. I get an inspection done as well. I get the car back and when i do a cold start its very rough, almost like it doesnt want to start, i changed the air filter in hopes that it would correct the problem, no luck. It will run rough for about 1 minute or so then its fine everything sounds as it should and i dont feel anything than i normally would. Any ideas as to what the cause would be?