i was going down the road and looked down at the tack and it was not working.engine died.so it wouldnt start i put gass in it then it started,but went a little then died.also tack does not work. got it started but tack didnt work,drove it home a few blocks and let it set for 15 mins or so,it started and the tack worked,whats up?plus black smoke came out of it too.from uder neath.it sounds like its out of time when its trying to start.but when ya let it sit it starts fine and the tack starts working again.could this be the cam sensor?or crank sensor? and how hard is it to put in the crank sensor?i can do the cam one.