i have a 48 inch gravely walk behind with a 15 horse kaw on it. it is a 2003 and only has 115 hrs. i would just take it to the shop but i dont have time too so i appreciate any guidance to help me fix it. it died today while mowing. then it wouldnt start for a while and when it did start it sputtered a little then started running smoother at an idol. eventually i got it up to full throttle then started mowing. 1st, 2nd ,3rd, then in 4th it died again then i went through the same procedure and it wouldnt even get the blades engaged. so i took it home checked the plugs, cleaned the airfilter, checked the oil, and all the plug wires. then i took off the plastic and was going to turn it over and pull 1 plug and check it for spark. now it is locked up and wont let me pull the cord at all. first can anyone help me get it unlocked. then any ideas on the origional problem. thankyou for your time.