Desperately looking for a cure, TSB for egr has been done, throttle body cleaned, plugs and coil packs replaced but nothing works !!! Light surging while between 55&60 mph, 10x worse when towing. & The surging will stop if you apply power or release the accelerator, MDS disabled. Multiple dealers say it's typical but no way this is normal operation ! Anyone try using a tuner ? Did it work ?