Could be numerous things. Here is my list.

Check your battery voltage by voltmeter.
Check fuel pressure?
If fuel pressure and battery voltage is ok. Then starter is bad.

I hope this helps.

__________________

Kamal Atwal
2005 Triumph Bonneville T100 (Black/white) [Sold]
2007 GL450 (Dersert Silver)
2009 Toyota Corolla (Metallic Silver)
2002 Tundra V8 - 2WD (Desert Sand)
1995 MB E420 (Silver Smoke) [crashed, now resting in peace at Silverstar Recycling Center]