Thanks to everyone who helped suggest where to find an engine for my 93nx2k. Got it from Soken for $600, looks and runs real good. I finally get to see what a great engine it is. My last one was not very well taken care of (bought the car in Feb.) and was all gunked up, lot's of sludge. Looking for suggestions to keep it clean, esp. the throttle body w/o taking it off. Any filter for this?