91 240sx KA24DE manual. The problem: Car will intermittently bog / shudder at random times, exhaust stinks like its running rich. I tried pulling over and pulling wires to see if its a misfire / which cylinder but its so damn intermittent that it returns to normal before I can get under the hood.
Background: This problem started out as happening only once a month then got more frequent. Eventually it got to the point where it was happening several times a day (about every ten minutes on average, but at random times. hot or cold doesn't make a difference). I changed the spark plugs (~0.040 gap) and the problem went away for about a month. Then it came back slowly. Now its getting more and more frequent...
So I figure its an ignition related problem based on the new plugs fixing the issue temporarily? I remember getting new wires a few years back but can't remember which 240 I put them in
. Could this be a fuel related issue (injectors?) even though changing the plugs fixed the problem for a month? (I know cars can be weird like that)
I'm gonna check the ECU when I get some free time