WE HAVE A 1997 FORD EXPORER WITH A 4.0L ENGINE THAT HUNTS INTERMITANTLY. IT HAS SET A RIGHT BANK LEAN CODE ALSO. WE HAVE CHECKED FOR VACUUM LEAKS, REPLACED THE PLUGS, WIRES, AND REPAIRED A VACUUM ACTIVATED THROTLE VALVE THAT CAME DISCONECTED. FUEL PRESURE IS G... Login to read more.