I'd reccomend checking that the diaphram on the egr holds vaccum. Put vacuum on the egr's vaccum port, then watch to see if the valve closes. It should hold for a great amount of time, theoretically forever. If it moves closed within a couple of seconds the diaphram has a pinhole in it. When the engine reaches operating temperature and the EGR valve tries to open it won't, then the DPFE sensor will take note and turn on the MIL.
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93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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