I got this too. Running mem graph shows the mono heap allocation spiking when parts from this mod load into the world and the garbage collection subsequently runs every 10 seconds or so, hence the periodic "stutter" (it's unity doing its thing). I can't see anything related in the logs, though I'm not an expert. It doesn't really manifest when running the mods (Foundries+Wheel) alone, presumably as there's sufficient overhead to cover it, but when you add in a couple of parts/graphics/life support things tank rapidly.