Yeah, injectors, nozzles or whatever these can be called. Well, age doesn't come alone...
If injectors are spraying fuel badly, then there will be rough iddle just because fuel doesn't mix with air as good as needed. Is there any difference in iddle roughness when engine is cold or hot? Heat helps fuel to vaporize... Actually, with such old car there is need to pull out all injectors not just to check how good they are working but also is fuel metering unit [or whatever it's called, I forgot that name] ok, because it can wear out and couse, let's say, one injector to spray less fuel - altough looks like u guys there have cars with less mileage than we here
Only problem is that upper part of intake manifold must be removed to do it. I'll today
change valve cover gasket of my NG [before that I'll paint valve cover and that piece of intake manifold] and after washing a lot of oil and dirt off the lower portion of intake manifold I'll pull all injectors out just to check if there is all ok.
If u can get timing gun, that's ok, without it it's possible to adjust just as well than with it, with some knowledge, of course. But don't forget when u will get NG distributor, u will have to do it again
