In informal English, we often use idiomatic expressions with and instead of the infinitive marker to, when linking certain verbs with a following infinitive:
- Come over here and look at these lovely flowers.
- I'll just go and get something to write with.
- Run and get me a tissue, will you darling?
- Are you going to stay and have lunch with us?
- Make sure and let us know how you get on.
- He wants to try and find a new job.
It could be said that there is a certain logic about the first four verbs: first someone 'comes over here' and then they 'look at these lovely flowers'. Or first someone stays and then they have lunch. But we can't really say that for make sure and try.
I've already written about go and do something (link below) in answer to a post at Literal Minded, so I'd thought I'd try and have a look at try and.