Rough idle... only when warm.

Jonathan,
After installing a brand new Edelbrock last year. I had an
Intermittent backfire and ran hot, thought it was timing or a secondary ignition problem. Tried everything with no luck.
A wise ole mechanic said the carb was no good, he "didnt care if it was new".
Had it rebuilt, never ran better, smoother, cooler and stronger. Guessing it had an internal Lean issue.
Who knew?