ok, i have a 2004 murano 3.5, bought it use, had a few, well a lot of problems, so, changed both valve covers and pcv, plug oil seals where leaking, had one bad coil, got a set of new coils and plugs, original ones, used to have a code p0300, now its sometimes pending, once we replaced all those parts, it was fine for the first ride, after that, i get misfire or hesitation under light load, way to much gaz, not a real electrical misfire, idle or full throtle, no problem, things we founds, intake was full of oil, its smoking a bit, cat are empty, compression is betwen 130 and 138 all cylinders, we checked timing, cams are fine, the chain didnt jump, fuel pressure is 42 and higher on rev's, got the factory manual, its perfect, injecter where cleaned and tested, there all spraying fine and none are leakings, we had a 02 sensors bad that we changed, did the re-learn procedure, now, on o2 sensors, the readings are fine, on a/f sensors, bank 1 short trim ( long trims confirms it both) average is around 0% on driving normaly, but, on bank 2, average is a wopping 25%, but no code on a/f malfunction, just a pending 0300 sometimes when we try to drive it nicely, gas consumption is......like a v16 (drive computer says 32 ), we tested with propane for vacum leaks, none, all the vacum lines seems at the rigth places, im really getting deseperate, have an obdb car doctor for readings

corrections, compression was 178 on all cylinders except 5 at 172