On the intake manifold stay (big bracket that bolts the head to the block on the back of the intake mani) is a little connector attached along with the knock sensor. That needs to be there and connected. I am not sure if that is what you are calling the "ground." It is a little connector. I posted a pic on here a while ago.
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97 Viper GTS
03 Mercedes CLK500 rollin on dubs...
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