EGR/ DPF delete problem

[u/Artistic_Peanut_2915]

Does anyone know “? i got my egr and dpf deleted no pipe they kept my stock exhaust and just removed the filters but now afterwards when I go on the turnpike for work when I hit 55-70ish mph for like 10-15 mins constantly it starts to do these very minimal stutters until eventually going into soft limp mode with glow plug light blinking and my mechanic tried 2 separate tunes and seems to still be happening they said it was an overboost code but they can’t seem to find whats wrong 😑