Fishin Guide, I got check eng. light on. Cycled the key and got P 1694, P 1693 and P 1698. First time they sad, nothing is wrong with the truck, then after I got the same codes, was told "bad PCM-need new one". The tach would drop to 0 while driving, that goes up to normal, then freezes, back to normal,fine for few min. , then the same story again. So, I'm not driving it as I do not know if will stall somewhere and leave me on the road. So I need a PCM. If someone knows where I can get one, let me know. Ilian