It could very well be the vacuum operated petcock failing.

Go to this link, and follow the test for the petcock, and you may need to get a Raptor Petcock to replace the stock one.  Be sure to get the correct Yamaha part....not a Chinese replacement.  If you don't see the correct Yamaha part number on the white box from Yamaha.....buy it somewhere else.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1366651397

Dave

Petcock seems to be fine.

Cleaned the carb, which was already pretty clean. The bike stalled again the other day on the highway in traffic, going about 30 mpg. Got it running again after waiting about 20 minutes but it stalled out again a few minutes later. Seemed like it got up running *better* with the choke out even though it had already been running for awhile.

The problem seems intermittent but Friday was the worst, ended up having someone come with a truck to pick it up.

If the carb and petcock are fine, any other advice as to what I should look for?

I had a few bad noob weeks a few years ago when my petcock started failing. I didn't want to believe, nor did my full trust in Suzuki dad want to believe Suzuki would put a faulty part on one of their bikes, but they did.

Mine had the same symptoms as yours except it would only stall out above 50, but it ran horrible at slower speeds. I changed the spark plug, cleaned the carb, messed with the needle, adjusted the valves, etc but finally said whatever and bought the simple and easy to install Raptor petcock.
Fixed it instantly and forever after I've been a slave to the savage forum lol.

So it could be something else, but my advice is to go ahead and buy the petcock anyways because the stock vacuum system is going to fail. If it fixes your problem in the mean time then even better! It probably will too...