Fire Effect Programming

Helllo
I Wanted To ASk If Somone Can Help Me On Fire Programming
Its Very Difficult To Programm A Good Fire Effect And There Are Many Ways - I Remember That in Dos Pascal I Programmed One By Putting 4 Pixels red And Taking Avarege Above THem Of 2 pixles - it was very complicated and i want to do some engine fire effect - like a plane and stuff
if anyone knows how to do and can explain me please do so
:) THank YOu