Is this something new on the car?

Condition of plugs/wires/rotor + cap?

The coils on the 103's rarely go bad. They are pretty solid.

And as dux mentioned, goodluck getting anywhere 18Hg!! Both my 103's ~12-13 at idle.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k