i have a 2007 freightliner detroit diesel 14. 60 series wich i lovbe my truck ,has never ever giving mer big issues other than a governer that a freaklin dealer couldnt figure out but finally fixed it..but now i have a little issue.. my truck looses power sometimes it slow goes sometimes i feel like its lacking ..my mechanic tells me itys the EGR and wants to put a chip to by pass EGR dont know if its good idea..NEED SOME ANSWERS PLEASE ..wht should i do..thanks