Hi Jeff L,
Guesswork is not the best means of getting the job done.
You should try to isolate the cause and I would suggest trying the following link to understand better how to go about trying to get to the cause.
http://www.2carpros.com/first_things/car_cranks_but_wont_start.htm
If you need any help, feel free to ask, but please remember that we can only be of help if you are able to provide proper and detailled information.