P1131 and rough running
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P1131 and rough running
I have a 97 F150 5.4 with 154000 miles. It has new accel super coils on it and new plugs (about 6 months ago or so) It started running rough occasionally and then last night it was running rough and then the light came on. When I put my scanner on it I got the P1131 code. If the upstream is working correctly wouldn't the downstream react the same way? I don't find a vacuum leak or an exhaust leak. I haven't had time to check the fuel pressure yet. Anybody have any suggestions? 
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