Well here I am again. Needing help.

Yesterday after work I went to start my car and it woulld just turn and turn and turn without catching.

No problem I thought, had it towed home where I had a pile of parts I was going to replace.

Did it today;
spark plugs
wires
ignition coil
fuel pump
fuel pump regulator
and last fuel filter

well it started just fine so I was happy.

Went out to it about an hour later and once again, just turned and turned and turned.

Timing belt and all that was done about 2 months ago.

What could it be?