that's EXACTLY what happened to my 97 f250 PS and i replaced the ipr valve and it was fine after that ...i found one on ebay for 125.00 new.... but the " fun" part is getting @ it.... on my 97 PS it's NOT at the back by the turbo and the ONLY way to get at it is by removing the fuel filter bowl, then it's easy to get at .... hope that helps