I have a Craftsman model #917.376583, We can get it running but it only runs a few seconds and then dies. Also, the primer bulb doesn't have any resistance. I read another post that said to do the following... Remove the main jet and clean the holes with a fine wire. I did this but now can't get it to crank. Any suggestions? The mower hasn't really been used a lot. And don't want to have to buy another one!