Re: fuel filter????
My 89 has an idling problem most of the time. I've adjusted timing and mixtures to produce best results, but there's still a problem. In my case, the carb (Carter BBD) has a few vaccuum leaks where the linkage's run horizontally through the carb. It's a little loose, and I know it's the problem. Just old and worn out. I haven't gotten to replacing it yet though. Most every problem is different, and I'm sure yours is too, but thought this might give you something else to look at.