2006 e-350 passenger van .no power under load from stop on 30 percent grade .
untill i hit 2000 rpm then gets better from there .highway 15 to 20 percent grade runs fine power is fine lots of power at highway speed only issues are there at stop under loed any ideas on what direction to look the motor is a 5.4 just did a total rebuild runs strong im pretty good at turning a wrench .not so good at the electronics of the newer automobiles .not kicking any codes. im stumped could use some direction on what direction to lean twords to find the issue and get it fixed has traction control if that helps thanks in advance for any help
