So My Girlfriend’s Boss has a 1988 Nissan Pathfinder V6 4x4 Manual, Its misfiring, the exhaust smells of unburnt fuel, the exhaust rattles and its blowing black smoke out the tailpipe. It drives like it has an artificial limiter at 3k rpm and it stalls out at idle. the issue gets worse once hot.

The Good:

  • New Fuel Pump
  • New spark plugs
  • new wires
  • new cap and rotor
  • new fuel pressure regulator
  • 10 year old cat

The bad:

  • original throttle body and injectors
  • original intake and vacuum lines
  • original AB valve
  • 350k+ miles
  • 150k Mile timing belt (at least, hes never done it as long as hes owned it)

Im thinking either its got a pretty severe timing advance that is forcing the ECU into “limp mode” at 3k or its got a clogged cat. What say you oppo?