Barometric ambrient pressure sensor wrong reading

[koliunia]

Hello everyone. I got deleted cm 871. My ecm derates to 30- 33 psi of boost, due to high altitude. So I completed barometric pressure reading (24.5 in Hg) with current barometric pressure (30.1 In Hg). So difference is huge. I put a new sensor and got my 38 psi boost back to normal, But next morning problem reappeared. I bought another sensor, and switched them around with no success. Harness and plug looks nice and clean. Does anybody knows if ecm uses any other sensors to calculate barometric pressure?[/size]