if there was a carb id know exactly what to do but there's not. I replaced the TPS, the old one was not giving continuity to the higher range points. I have had the throttle body off 3 times now and I am at the end of my rope.15 lbs of vacuum on the manifold holding steady, I can't find any vacuum leak, the MAF is clean and moves freely. if I rev up high before I load it up it will go. I can get the van to 60mph. I'm all out of ideas. when I step on the gas fast it dies out.