No idle after back fire - 34DMS(A) Weber

[pressonregardless]

Looking for any information on cleaning / rebuilding a Weber 34 DSMA on my 1974 Spider 1756.
It has run very smoothly on several trips over the summer and I was running around town on some errands and all was fine. The engine sat in the drive for about 1 hour in 95' temps and I went to start things to put it away for the day. As I cranked, the engine (what I call backfired, or burped in the carb/air cleaner assy). I cranked again and now I have no idle. I drove around the block and all is fine above 1500 rpm, but can't idle. I pulled all plugs and wires, all clean.

Any thoughts, I believe it is something in the Carburetor circuit since the problem instantly appeared when the engine choked up on starting. Charlie

[76was124]

Do you think it could be timing, as you might have jumped a tooth on the timing belt, or are you thinking more like a fuel problem like a vapor lock?

[timinator]

Could be as simple as a vacuum hose has been blown off by the backfire. It usually is one that you can't easily see. Or maybe a piece of gasket blown out. Just depends on luck or the lack of luck.