Starts to crank, but stops almost as soon as it starts, will not start

[homerdo]

2002 Jeep Liberty with 3.7L V6

M issue is that turn the key on and everything works and looks good. As soon as I turn the key to the start position, it tries to crank but ceases to crank almost as soon as it starts.

Did several things to this vehicle today/recnetly before the above issue started.
Today

• Changed spark plugs
• Changed coil packs (all 6)
• Removed throttle body and cleaned
• Flushed heater core (had a no heat issue)
  Added anti-freeze as it was low and car was overheating last night

Also in the last week, the vehicle has a new battery and alternator.

After I did all the work today, the vehicle started fine and I took it on a 15 minute test drive with no issue. Overheating issue had stopped and vehicle held temperature just fine.

Then went out a few horus later to move car in to garage and I got the "starts to crank but ceases immediately" condition described here. Please help if you can. Could this be a starter issue?

 

[tjkj2002]

Remove spark plugs and try and crank over.

If coolant erupts from cylinders if it cranks you have a bad head gasket(s),cracked head,or cracked block.