had an engine light on, egr flow insufficent, replaced the egr and fuel filter, also did a fuel injecton flush, no codes now but it still doesnt have any power, im thinkin a clogged cat? any other suggestions?

Try cleaning your MAFS sensor. See this (http://www.automotiveforums.com/vbulletin/showthread.php?t=691451) thread for more information :)

that was done when i did the fuel injection service