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Check PCM and FP diodes

Should be 2 upstream of the cat, and one downstream on your b3000. 3 total O2S. This is different from the Rangers according to this book I have.

I would pull the spark plugs and see what the look like. Then check for vacuum leaks. Sounds like it might need a tune-up. Plugs, plug wires, air filter, oil change. Clean EGR, PCV, MAF, IAC, TPS

I have only used full synthetic in my 280k 96 ranger for the last several years. It doesn't leak a drop of oil. The other fluids have also been replaced with synthetics. Rear diff, tranny, brake fluid. This is my choice, but it would run just fine on straight 30 weight tractor oil. Using...

I You should try replacing the OEM filter with a K&N first in the existing air box. Either with or without the restriction at the fender.