There are many possblities and following are a few that are possible reasons.
1. Distributor. Ignition coils sometimes fails when they heat up.
2. Engine Coolant Temperature (ECT) sensor, works with temperature and good when cold.
3. Fuel pump.
Clutch would not be likey, as the symptoms would be slipping when accelerating, not hesitation.
Sunday, March 29th, 2009 AT 1:58 AM