Started one morning on the freeway with no evident cause or trigger. The turbulence only occurs while accelerating when the gas-fueled part of the engine is running. Noticed when I got home that there was a wind-strewn mess of a gray, greasy gelatinous (fluid?) On the bottom,back of the engine by the axle and right-side control arm. Have any ideas what (if any at all) part/parts could've caused this?