I have an 05 f250 107905 miles on it. 4 inch down pipe, 5 inch the rest of the way. SCT tuner. My over flow cap keeps popping and leaking. I asked the dealer about it and they said the egr system needed to be replaced. I just had an EGR delete kit installed. Drove 15 miles from the shop to home and the new cap blew and leaking again. Any ideas where to go from here?