hi i have a 94 22re xcab. today i puled out on the road and noticed an clicking sound coming from the motor when i would rev it past 3000rpm, i started driving to my house and it got worse and by the time i got there it was doing it and any rpm and had no power and would not idle. the clicking was coming from the valves so i adjusted them ad it helped a little but still clicks and wont idle. im pretty sure it needs an o2 sensor because it runs pretty rich and wasnt runing quite right so could it have went completely out and some how caused the clicking or do you think there is another problem?