Loss of power
I've got a '01 F-250 7.3 with 160,000 miles on it. Have had no problems out of it til just recently. My transmission started acting funny the other day. When shifting from first to second, it would just rev on to 3000. You would have to let off for it to shift. And no, I did not say slip. It held the gear just held it too long. It did this pulling a trailer and not pulling one. Took it to the transmission shop (friend of mine) and he put his scanner on it. Had a wastegate code and a PO603 code. He said pull my programmer (superchip set on tow-safe mode) off and we would take it to a buddy of his at the dealership. Took the programmer off and now the truck acts like the wastegate is staying closed; has a substantial loss of power. Only difference is that it does not idle high. Put the programmer back on, has more power and now has hard shifts and doesn't hold first gear like it was. Any suggestions?