my vauxhall cavalier 1992 1.6 gl (16 sv ) eng sometime takes a few secs?

my vauxhall cavalier 1992 1.6 gl (16 sv ) eng sometime takes a few secs longer to start but when it dose evently start it sond like it has flooed the carb when it has cleared out it runs perfect and smoth and it wont do it for a few days and then it will sundely do it againe it has 152300 miles on it i have change the plugs leads and dissy and roter arm and sprayed carb clener downe it and redxed it pleas help adam