The last three times I've started my 06 6.0 power stroke it doesn't Want to fire. It turns over about 6-8 times then will barely fire.. sometimes I have to turn key off and let it turn over again for another 6-8 times before it fires.. when it does finally fire it is real low rpm then builds up slowly.. any suggestions?????

 

I would check for internal oil leaks first. Also make sure your batteries and charging system are good. Does it turn over normal or slower than it used to? Needs good volts and oil pressure to fire. Sounds at first glance that you may have low oil pressure. Send more info if you can. Miles, any mods. . . . .