No power in my car

Good afternoon. I'm also having a problem with my Tata bolt xms that i bought in 2016. Now the problem is that it loses power and it just jacking when moving from gear 1 to number 2. And my bet is that i just did a service thinking that its maybe a spark plugs that are mis firering by after that service i did its still drives the same as before the service and thats frastrate me big time coz i know that the car drive smooth thats 1 thing i can say when its fine. I'm a tata fan i must say but when the cars does this after not for so long it give tata a bad name. Tata sa where to from here?