my son has a 2000 ranger 4x4 with a 3.0 engine...recently swapped the engine...put a 98 model 3.0 engine...truck has been running great...last night it started blowing the rubber vacuum lines that run from the egr tube to the dpfe sensor....changed out the sensor with the one from te old engine...seems like their is way too much pressure coming from the vacuum tubes...any ideas what is causing this?