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While idling, I hear a "tick" from under the hood, thinking it could be the coil arcing? Plug wires are tight. Friend is bringing over new coil pack, Is this a good place to start?
 

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Ticking could be from drivers side header leak.
There known for cracking.

JFH
 

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Fuhgeddaboudit
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It could be a plug wire or many other things like an exhaust leak to the cam sensor. most times when a plug wire or secondary ignition problems you will get the ticking on an off radio channel in sync with the underhood tick.
 
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