I have had a problem with my pathfinder the engine starts but it pulses at all rpm ranges i have changed fuel filter, pluges, wires, distributor cap and had the catalytic converters checked they are clean fuel pressure is good wondering if it could be the fuel pressure regulator. the mechanic that look at it for me said it was getting to much gas. is there a sensor on the throttle body that would cause this.

Welcome to NICO!!I have to be honest -- this one will take some time to research. Can anyone chime in here and give us a hand?

if it helps any the engine runs like someone is tapping the gas rapidly.

Have you checked all vacuum lines?

fueler wrote: Have you checked all vacuum lines?

Good call. . the second post would leave me to believe this too. my gf's car had this problem recently actually, but it would hover around 4k.

One line was disconnected, the other had a split in the tube.

I have looked and listen i have not tried soapy water will that work for vacum lines or is there a better test

are you getting any SES codes? i would just even try unplugging the battery over night and see what happens. i know one of my 02 sensor wires melted together when it touched the exhaust manifold and caused all kinds of crazy problems, i would also check your ground wires.