Originally Posted by greygoose
My buddy had a similar problem on the same truck / motor. He was getting codes that said multi cylinder miss fire. it turned out to be the cat.
Cat? I killed that a while ago...
My truck hasn't thrown a code since this started, it was throwing 02 codes before, but that is because the cat is hollow and its not in the direct stream of the exhaust... can change the 02 sensor and get another 02 code 5 minutes later. I guess this could point to another problem... but I haven't been able to pin anything down and it ran GOOD until the last few weeks, however, it wasn't until on the way home last Saturday that it became nearly undriveable.
Also, when its acting up it wont idle. The idle was good up until 2 weeks ago but it wasn't erratic enough to warrant any investigation until now.