Engine start problems?

[l.downen]

Sometimes when I crank my engine it starts really weak then comes up to regular running. & sometimes it takes 2-3 cranks. Possible problems?

 

[TERRYCCTT]

what do you mean. it cranks slow or it runs slow and then revs up. if it cranks slow its just a weak battery. if it runs low "rpm" try cleaning throttle and maf. if that dont help it could be fuel pump related

 

[l.downen]

Runs low then revs up... Got a new top-notch battery a month ago. Ran some fuel injector cleaner through it and it didn't do anything

 

[2000Yukon]

Could be the fuel pump.