We have evenflo stroller. I think it is apart of the auro line. It has the one handle steering. I was wondering can any evenflo car seat snap in to that stoller or do I need to by a special carseat made for that stroller?

Straight off Evenflo's website:
Question:
What car seats can attach to the Aura Travel System?
Answer:
Only use the Evenflo Embrace and Evenflo PortAbout infant car seats. Other infant car seats or carriers are not designed to fit the stroller frame and may result in serious injury to your child.

https://plweb.evenflo.com/faq_detail.aspx?faqid=5785

http://www.car-seat.org