Try doing a fault code check first: Checking error codes VR/VS (Revised) as it's possible it's the crank angle sensor playing. You can pour cold water over the CAS to get it going again - not sure what you mean about pouring water over the coils as that will damage them. However, the missing problem at cruising speeds is sometimes caused by bad coil(s), leads, plugs or the DFI module....just a process of elimination to find the actual culprit. Good Luck.
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