[suprbuick7]

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?

 

[JFH]

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

JFH

 

[ULYCYC]

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.