Check the companion clyinder. coil packs control 2 clyinders. Since it happened when you went over a puddle you may have shorted out the coil or check the ground. If water got far enough it could have created short somewhere. Do you have belly pan installed?

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)