This mower was given to me 3 years ago and it has always seemed to run a little slow, ( self propelled), but it cut good and always ran smooth so I just used it. Anyway, I bent the throttle linkage on something and after I "straightened" it out, the engine ran like it was a 20 hp! I thought "great"! So I got about half my yard cut tonight and it acted like it ran out of gas. Now it will crank and run good for maybe 2 seconds and then die. I can pump the fuel primer and get it to run just a little longer than normal, but that is all. Any ideas?