Ford messed up the gapping on the OEM plugs and this is part of the problem with the Ecoboost shudder at 55-60mph. The spark plug gaps are all over the place from. 035 to. 046 on just one members engine.
At the time of publication, the average cost of concrete for a 400-square foot slab, the typical size for a two-car garage, ranges between $583 and $637 or between $1.46 and $1.59 per square foot. On average, contractors will put in about 13 hours of labor to finish a two-car concrete garage slab.
However, since this is a labor-intensive project, the cost of labor will often be significantly more than the cost of the materials themselves. On average, the cost of installing a cement slab can run between $3 and $12 per square foot of space. However, that number may be higher or lower depending on whether the terrain needs extensive work beforehand, the concrete thickness is unusual or the homeowner helped prepare the site.