1995 320 i, RUNS ROUGH AFTER 2 MIN

i AM WORKING ON A 95 - 320 I , WHEN THE VEHICLE IS STARTED COLD(-10 IN ON. CANADA) IT RUNS FINE BUT ONLY FOR ABOUT 2 MIN, THEN IT HAS A HARD TIME TO RE START, IF TRY TO REV IT UP, IT WILL BACK FIRE THROUGH THE INTAKE AND SMELL OF RAW FUEL OUT THE TAIL PIPE?
DOES ANYONE HAVE AN IDEA , OR MAY HAVE RAN THROUGH THIS BEFORE?
:banghead: :screwy: