I'm worried....my 1st gen has been good to me. I have noticed this problem happening and I need some feedback from you guys to help me decide what to do. This is something that has been going on for a week or two. I've had the car for about two years.

It happens when I'm driving in the city. Minor stop and go. When I approach a light and sit at a dead stop with the clutch in, at idle- the needle bobs up and down as the speed of the engine irratically idles. A light touch of the gas pedal is required to keep it from stalling as I'm sitting there. I've been witness to the RPM's going as low as 500 or so and then I have to apply the gas to keep it going. At that point it still runs irratically and goes back to being smooth once I drive off. This doesn't happen all of the time, but more frequently than I would like. It sounds like this......blub blub blub blub blub blub blub blub blub then when I drive off- bruuuuuuuuuummmmmmmmmmmmmmmmmmmmmmmm. You know

My first thought was that it was the carbuerator that needed some attention. I purchased carb cleaner. Took the filter housing off and cleaned the exterior of the carb which had minimal dirt. Gave it a few shots inside the carb and blew out some carbon. Thought I fixed it at that point, but was driving around today and noticed it doing it again.

My thoughts, correct me if I'm wrong- possible fuel issue (clogging, dirty fuel filter etc) or attention to the carb is required. How will I know if it is something major where say the engine needs to be replaced? The engine is in great shape. All the seals are good, no oil leaks and very clean. Well maintained original engine with approximatly 90k miles on it. I drive it nicely.

What should I do?

Thanks in advance.

Mark