My "88 Fj62 just got a valve job and I've been struggling to get her running smooth every since. Timing should be right, plugs are new, wires look OK, but I'll be changing them next. I'll try a new fuel filter as well. But I hate wasting money replacing parts needlessly. The vacuum seems OK, if I take off the oil filler cap off she starts to really run bad, so I'm assuming it has good vacuum. I've sprayed carb cleaner around the engine with no noticeable change. What's also strange is it runs better with the A/C on, but that could be because the idle raises with it on. And when you first start it up when it's cold it runs smooth, it starts to skip as it warms up. Need help before I replace every part under the hood.