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96 3.8 stock i have a hint of pre-ignition on the ps of the engine at 80-90 percent throttle and p0174 bank 2 too lean. seems like never at wot. back in 2010 i had a stuck injector that opened up with cleaners. time for flow measurement on ultra-sonic machine? some hard carbon acting as glow...

Why does my eec-v run such a pig rich fuel trim that the cats slowly clog, the engine vibrates, horses are missing, and fuel mileage is :poo:. I'm talking it cant get more than 20-22mpg highway babyed and if i wale on it, possibly as low as 8-10 mpg. When i got the car the damn thing could rip...