So I'm at the track right now. I did a burn out from 1 to 2 gear. Then I launched in 1st gear at about 2.5-3k rpm. And it popped out of 1st!!! What does that mean?? Please help
popping out of 1st gear on launch - 6G Celicas Forums
most likely means it's time to take the transmission apart. 
Bust a Deal; Face the Wheel.
Check the motor and trans mounts.
2000 Celica GTS 'slowest gts evar'1998 Mazda 626 FS-DE/CD4-E
I thought this was always a clutch related issue, not the mounts..I could be wrong but I recall reading about similar issues on here. Perhaps a search will help come up with answers
-Protection mode, For when your amp tries to blow its load.1995 Toyota Celica GTS-Daily Driver1999 Chevy Cavalier-Winter Beater1994 Honda Civic CX Hatchback-DeadMy Celica!
I agree with checking the mounts. If the engine is rocking hard enough during a launch the shift cables might be affected. Or the synchro is severely worn, but if that the case then you would have shifting problems in general