Hey guys as you know i put the 2.5 i motor is my 84 318i, everything if fine engine runs good. but now i started getting problems, i started it today adn it was cranking but didnt fire, second time it started and after it starts it runs rough for a min or so. is this normal? its got arounf 185,000 miles on it. also i swaped everything out exapt the intank fuel pump and the exteroir fuel pump, could this be the problem???