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I thought I'd replied; since #7 and #2 are right next to ea other in the firing order I'd look for bad wires, bad dist cap (carbon track between them?) etc.

5 & 7 are right next to each other in firing order in the cap and on the engine. Very easy to mix those 2 wires up without noticing it. At an idle the miss when this happens is sometimes barely noticeable due to the closeness of the firing in the firing sequence, but under a slight load condition or slight pull the miss becomes very noticeable and can cause backfiring under load.

Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!