If there are no codes, it could be as simple as weak spark from worn out plugs. When were the cap, rotor, plugs, and wires changed last?
With the coolant leak; have you removed the pressure cap to check if the level was low and filled it from there or just refilling the reservoir? It’s also a good idea to change that cap every few years anyway, if the cap spring gets weak the coolant will boil at a lower temp.
Also, you might want to have your battery checked, a weak battery can cause idle/stalling issues.
Last edited by ZCR1; 11-18-2011 at 04:04 PM.