So ive recently been having some issues with my Gp. Started off that i was surging at certain rpms as if a vacuum leak but no cel. (Recently found out that its a bad egr) but while this was going on very randomly and not that frequently i would be getting on it and the car wont let me go over 5k. Normally i shift at almost 6k no issue. I can hold it pinned at 5k and nothing happens. I did notice last time this happened that my boost dropped down at this time. I dont think its egr related because ive been driving with the egr unplugged so it no longer surges. While the egr was unplugged it did let me rev freely. But just yesterday i was racing around and it didnt go too well. No cel for anything other than my egr. And like i said before it was doing this before i unolugged the egr also. Btw, while diaging the surging, i verofyied my cat is not clugged.
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