NHTSA Complaint #11462105 — 2015 CHEVROLET TRAX

I have recently heard what could best be described as a squealing sound. I could also smell fuel inside the vehicle while driving. I thought it was oil that had leaked onto the serpentine belt and had it replaced but the noise continued. Listening closer I realized it was coming from the area around the intake manifold. Searching online I found several YouTube videos and comments from people mentioning loose spark plugs caused their issue. Checking mine I found that two of the four spark plugs were loose enough to not require a wrench to remove them. Tightening them eliminated the noise. I have owned this vehicle since it was brand new and have never asked a mechanic to check or replace spark plugs, nor have I done it myself. I did recently replace the intake manifold, which required removing and reinstalling the ignition coil. I feel like loose spark plugs represent a fire hazard as it allow the fuel to blow past the cylinders and into the engine compartment.