Spent 3 hours chasing a phantom misfire on a 2018 F-150

Everyone said it had to be a coil pack, but it was a tiny crack in the plastic intake tube after the MAF sensor. The truck would idle fine but stumble under load. Anyone else had a weird vacuum leak that didn't throw a code right away?

2 comments

2 Comments

wadepalmer1d agoMost Upvoted

Ever find a vacuum leak in the weirdest spot?

casey_campbell1d ago

Found one in the heater control valve once. It was just a tiny crack in the plastic housing.