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I have been having trouble with my truck going into limp mode if I get on it very hard for too long. I have a bully dog on it but with it on or off makes no difference. Took off cat recently and helped some. also replaced fuel filter. Im up for any other suggestions. it is a 2005. I am also...

I have a 2005 2500 hd chevy duramax 6.6 .recently took cat off but still have stock exhaust. looking into egr delete and fingerstick to get rid of codes. have a bullydog gt on truck. if get into truck too hard too long it goes into limp mode. it doesn't do it as bad now since removed cat but...