Hey folks, I have a 1995 F150 4WD 5.0. Starts easy, will idle up as normal for only a second then goes immediately to normal idle and check Engine lights comes on. Idles fine and doesn't stall. Light will go off then come back on but, it is NOT flashing. Also, when putting a load on the engine, as in going up a hill, it doesn't want to shift down (auto trans). All this started at the same time. Any ideas? Thanks for any thoughts or suggestions.

 

Have you pulled codes?

 

Cracked vacuum line. Could be at the vacuum modulator on the transmission.