So the saga continues. I changed the ignition module and I now have spark to that plug. Put on new fuel lines, replaced a hose with hole in it off of air cleaner housing and put everything back together. It fired right up...off to cut grass. Within 5 minutes of cutting I could sense it's still not right. It still wants to and does blog down with blades engaged cutting at any speed. It will cut at 1/4 to 1/2 speed but you can tell it's having problems. At full speed the blades almost stop and mower has trouble moving forward. Dis-engage blades and it runs fine at full speed. You can even hear a difference in engine sound. Sounds normal. With deck up and blades engaged it still blogs down (not cutting grass but blades spinning). It also started back firing and popping after about 20 minutes while blades engaged. No blade spinning no back fire. The only other thing is I have to hold back on left handle to keep it straight. Pushing them both forward causes it turn go right slightly. I just need to adjust handles to correct but if I can't use it what's the point?
Thanks for all your help. I'm to the point of draining the oil, run it till it locks up and replace engine. At least then I'll know what's wrong.