cant flash kernels why?

[culua]

i dont know whats wrong with my phone but, before you guys tell me which kernel and which rom. i know which kernel to flash to which roms, sense to sense yes i know. but everytime i flash a kernel i get a bootloop screen. i wipe cace, and devik before flashing a kernel but still the same problem. i even switch recovery amon ra but sometime restoring with amon ra leaves me in the bootscreen for awhile and never goes pass to the main screen. the only why for me to get a custom kernel is by flashing a rom that comes with a custom kernel. please help me answer my problem. yes i even try download kernel manager same situation. i dont whats seem to be the problem. i used clockworkmod and amon ra recovery both same bootloop. i even tried differnt version of clockwordmod. if you want to know whats my phones version it is

2.2 2.15.00.11.19 stock htc kernel 18-2 #15 with ava-froyoZ3ro build pri prl 1.90_003 60677 Hboot 2.10.0001