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Message: [QUOTE="GCncsuHD, post: 788338, member: 10069"] Last night I was in my 2000 F250 7.3 6 speed, I had pulled through a dealership looking for a new car for the wife, switched the chip on "whisper" mode while I was talking to the salesman. As I went to pull off I switched the chip back to my normal 90hp tune, as I did this the engine nearly cut off but caught back up, the wait to start light and the SES light came on as if I had just switched the key on. It has done this before maybe a time or two, I just figured it got caught between tunes for a second, but this time the SES light came on. Truck drove normally so I drove it on home ~20mi. I cut the truck off and restarted to see if the light went away, it didn't, so I grabbed my code reader and got [I]P0107 (Barometric pressure sensor circuit low input)[/I]. My first thought was to check the MAP sensor, but connections and tube on it seem fine. After searching it appears this is built into the PCM and may require replacing or repairing the PCM? :doh: I cleared the code last night, but this morning, as soon as I started the truck I got a light again. I haven't gotten a chance to check the code to see if it is the same one yet, I will do that at lunch today. Did changing the tune hurt the PCM? [/QUOTE]

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