Its -2 out here in Nebraska, and yesterday my 2001 S-type 3.0, is now having a hard time starting, and after it does get started, it will die, i have to rev it up to about 1000 rpm and let it worm up, and after that everything runs fine? any ideas would be great..

 

Given your current temperature outside, your issue is probably due to some ancillary freezing in your fuel lines. This problem was more prevalent decades ago when gasoline formulas were very different from today, but freezing in the fuel lines can still occur even with modern fuel formulas. There are products in most auto parts stores and even Wal-Mart that can assist with thawing your fuel lines - you may want to do a Google search, then some research, before you decide whether to purchase one....

 

You might want to consider an engine heater. Three types I know of: 1-Block heater heats the coolant(Probably a Jag item,ask your dealer$$$) 2-Aftermarket coolant heater installs into a coolant hose. 3-Aftermarket oil heater. A replacement dipstick with a heater.
Check your local sources. Good Luck.

04STR

 

I agree with Jon89. Sounds like ice in the fuel lines/filter. Try dropping in some gas line antifreeze (methyl hydrate) and hope it works it's way up to the restriction. Depending on how full the tank is anything from a few ounces to cup full is usually plenty and it's dirt cheap.