Quit shotgunning parts at the problem and do some diagnosis. Try pulling the intake manifold and look for a vacuum leak at the bottom of the ports on the side that's fouling the plugs. Have the heads been milled?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!