Shudder between 50-60mph

[Veekay]

Odd as it may sound, this seems to have been EGR related.

Poor Fuel Economy...Sometimes

Problem solved! I did two things that could have solved my problem: I removed the EGR, cleaned it. It wasn’t too dirty, but I brushed off the surface and sprayed the inside with carb cleaner. I also cleaned the holes coming in/out of the EGR cleaner at the engine. The hole going into the intake manifold seemed pretty dirty. Cleaned it up with a wire pipe cleaner from harbor freight, and everything was a-ok. I wish I had seen how bad the blockage was before wire brushing that thing out. …