You installed the long tubes and cat back system yourself? you sure there are no leaks?
Then make sure those O2 sensors are connected and pwrground correctly.
If you have a multimeter do the following to check your EGR - EVP sensor:
-key off, disconnect EVP sensor connector
-connect the digital multimeter to wires black/white to Orange/white.
-disconnect vacuum line to EGR
-connect vacuum pump, increase vacuum
results 5500 ohms to 100 ohms as vacuum increases to 33 kpa.
If your multimeter jumps or drops out, sensor is worn in one place (replace sensor).
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