The starter problem was more than just a grommet swap. I noticed the bendix was not moving forward enough, dipped the pump in water the run it for a about 30 sec to clean it, after that the bendix moved all the way forward when the starter was run, replaced the grommet with a slightly different one ( smaller ) and the starter slipping problem is gone.
Moving on to the next problem, I had a flame out on the runway on TO the day before our jet meet, today I was able to start the engine normally and after a few runs at high rpms I went for a flight,TO was normal, I got to fly for about 5 min then, a flame out at high altitude, landed just fine.

What do you guys think, I didn't see any air in the lines, pump? thermocouple?