Sounds like the sensor on the side of your air filter box is bad or disconnected. In that instant when you turn the key on the ECM checks whether the pressure readings from that sensor and the manifold sensor are within some prescribed tolerance of each other - a rationality check.
_________________ 05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar, RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.
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