i have a fairly stock L98. it runs very good, minus oil leaks, but can't complain. i don't drive the car everyday, but when i do it starts up right away, most of the time. i'd say not even once a day where i will go to start it and it'll crank and crank and sound like it's about to fire but it won't. it usually takes about 3 or 4 times for it to start when this happens, or i just spray some starting fluid in the intake and fires right up.

but like i said, it doesn't happen very often.

maybe clogged fuel injectors? filter?