slow starting boxster

[tricky360]

I've just bought an eBay bargain boxster ,it's an 04 plate with 48k
and it has a problem with slow starting,
it turns over for a while before it kicks in and starts, I've had the battery tested and it's fully charged, just had a service done so new fuel filter and I filled it up with the good stuff petrol,
new crank sensor was needed also by its still slow, what else can I do ?

[tricky360]

It does it every time
It's been sitting for awhile before I bought it with low fuel
Seller said it will probably need good fuel and a good run but think it's not that simple