i just got a 1989 ford 2.3l omc 4 cylinder from my in laws it sat for about 2 yrs i am having a hard time starting it. my father in law thought he drained all gas but had a half tank that he thought i put in and tried starting it. i drained all gas put fresh gas in and changed plugs. still wont start it has spark and is getting gas it almost starts but wont any help or ideas would be greatly appreciated