cody11aaron
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- Joined
- Mar 24, 2013
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New to the group here, but seeking some advice/help. I have a 96 k1500 with the l31. Within the past month I've replaced the exhaust from the manifolds back with new cats and o2 sensors. When I got the truck back from my mechanic, it was running better than it had ever before (before as in glasspacks with no cats or o2's plugged in)... Until about 3-4 miles into the trip home, it lost almost all power like it was only running on half of the motor. When I got home, I unplugged the downstream o2 sensors and it ran fine again, it's only acted like that once with the o2's unplugged. Any ideas what this is or what to do? Thanks