This does sound more like an ignition problem. If it is eratic like that-if it is a fuel problem-possibly a power valve on the way out. Maybe a little tear that is oopening and closing it. Although this sounds very similar to the problem I just tackled in my 84. Thought for sure it was fuel-almost no question. Worked on the carb for a few hours and I decided to put some new plugs in that I had sitting on the shelf for about a month-while I was thinking about what else to change or adjust on the carb. Ended up that was all it was-just a change in plugs. Fired it up to run to a local parts store to get some info on my carb and it ran perfect. Has been running perfect since then. The plugs that I took out of the car were only about 5 months old-and weren't fouled either-very strange-but glad I didn't spend any more money.
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1984 Mustang
1997 Miata
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