I have a 2012 Ram Sport I've rebuilt from water damage. It's had every possible wiring harness and electronics replaced. It's giving a TPS code which the dealer replaced and still codes as. It will only rev to about 3000 rpm and barely wants to shift into 2 gear. only does about 25-30 mph. The eng and trans, (5.7 Auto) are out of a roll over truck and the interior is 2013 sent to a junk yard by Chrysler. It has a center console shift and the seat plugs don't match my 2012s plugs. so the seat air bags are not hooked up. would any of that cause a Limp Mode type situation? Could it be a ground issue? The dodge dealer had it a month and couldn't figure it out. I'd appreciate any ideas on what to look at. Thanks.