Hi Toxic, actually there are many softwares developed by engine research companies, such as Ricardo, AVL, CRF, ...
that can solve your problem, but since they all have commercial aspects, I have a good suggestion for you that is:
a book, named "An Introduction to Combustion" , by Stephen R. Turns, Published by McGRAW-HILL.
this book has a disk enclosed, which contains the very exact software you need.
Actually, be care full!, I have the second eddition of the book. the 1st eddition didn't include that software and I dont know about more recent edditions.
I hope it will be helpful...
Regards
Peiman