2002 Mercury Grand Marquis LS, 4.6 LITER acceleration problem

Question

**Recently, in the mornings, when I first crank up and pull off engine w

ould accelerate by itself and sound a beep alarm,at the same time, digital sensor guage will spike up then come back to normal, followed by jerking as though coil packs are bad. Later,after getting off work, it jerk a few times, then nothing. Coil packs, heat sensor &plugs are less than year old. Car is mechanically sound, since I am second owner Auto Zone scanned it...code P1299 came back. Car (Never) overheats.Temperature stays normal. At wits end trying to figure what problem(s) is. Please, help. **

Answer 1

P1299 Engine over condition has occured

Low on coolant could explain the high idle condition, then there the hesitaion as you acclerate. Check the upper radiator hose for any leaks,  what can happen if a coolant leak occured it may have entered into the sparkplug well causing the ignition to short to ground. There is also the area where the heater hose are it could of leak there. Either way you have low coolant level caused by a leak.