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Message: [QUOTE="Wyo6.7, post: 1450425, member: 20379"] Hello! Good afternoon, long time reader, first time poster! So I'm looking for some help and can't find the same situation on searching the forum. I have a 2012 F250 CCSB KR. I swapped the turbo out with a "used" SPE '15 style turbo kit. It had roughly 4,500 miles on it when I bought. Install was straight forward and self explanatory. I had custom tunes made to help take advantage of the new turbo, which is hard to find anymore since I run SCT. But now I have bad turbo surging under light throttle and cruise control. Bad as in when on cruise at hwy speeds it will jump from 11 to 20 psi and back and forth the whole time climbing a hill or in a head wind. Being as it fluctuates that much psi you can feel it the whole time. Also under light throttle with load on the engine it does the same thing usually like 8 to 15 psi, which can also be felt. No to answer some questions on what I have done so far. I have had about 7 different tune revisions with no change. Not I have an edge insight and the SCT X4 so my parameters are limited to what I can actually see. So i feel blind on some things. Here is what I tried on my end. If I unplug the MAP sensor boost gauge shows 40psi and you can hear that the vanes are open, so that's reading. Unplug the MAF and you get a fixed input of 16.38 on the frequency on the SCT and it builds boost oddly so that is reading. Unplug the EBP sensor and no change at all, 4runs the exact same with surging. No check engine codes and seems to react all the same. I have two different EBP sensors that I have swapped with no change. I'm just wondering if anyone else has ran into this problem and may have some insight to help me, or to point me in the right direction. Thanks in advance for any insight. Cody, [/QUOTE]