So, I have a 95 Ranger that has ran rough, no power, surging etc since day one. Has had a P0340 cam sensor code since day one also. Chased and chased this issue. New sensor, timing belt and set timing, check and tested wiring etc. Finally got the thought that maybe the alternator was bad and sending out a little ac voltage and messing with the computer. Unplugged it and bam... truck runs perfect.