Um, did he also say to make sure your hands are soaked and resting on the coil pack as you're dumping the water on it? Don't forget about adding salt to the water to help with conductivity...
On a semi-serious note, sounds like a sticking IAC valve....
\'94 Cobra #4963/5009, black on black, not quite stock
Formerly owned a black '00 SVT, #1972
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RIP - Ray "Old Fart Emeritus" McNairy