My first thot is the slide isnt dropping freely. When you let off the gas, does it idle down likie it should or slowly drop RPM?

Dozerman owes an answer to this question.

Petcock does not flow unless I suck on vacuum hose. What could be prob in carb? Could the float be stuck?

Try some Sea Foam in the gas.

Don't waste your time or money with Seafoam. There is nothing in it that is useful, and the sum of the do-nothing ingredients results in a do-nothing product.

I just recently had a similar problem, though with a scooter and not a Savage. The idle jet came unscrewed from inside the carburetor, and dropped into the float bowl. Result was that the engine would run at about half throttle, but not rev high enough to engage the clutch. It also blew black smoke out the exhaust. It also has a vacuum petcock, which had nothing whatever to do with the problem.

 
"Got black smoke and choking on idle. At speed bike runs ok"

 
What happens when the petcock diaphragm splits and dribbles gas down the vac line into the carb vac port?  

I think Serowbot's test kills 3 birds with one stone, which is why we get the newbies to do that first and report the results before telling them to do the next thing.

Yep, by all means don't do the simple test as specified that quickly tells you what's what -- instead run off quick-like and go tear on into that carburetor.

Forgot to mention.I replaced the air filter and checked for obstructions. Also replaced Spark plug........no difference.

Yes sir everything seemed smooth