I'd suggest to start here:
http://www.automotiveforums.com/vbul...d.php?t=687635
Couple questions --
How many miles and is it auto or manual trans? My first thought (as usual) is that it could be the CPS (crankshaft position sensor), as your symptoms go along with that. Have you had any other symptoms, like an engine miss here and there, or if auto trans, mis-shifting? Any coolant use?