yes it should idle for around 8-10 seconds without any problem. sounds like its running a bit to rich. turn it a tiny tiny tiny bit clockwise to run it a little leaner. rev up the engine (while placed on a block of some sort) this will clear up the engine from any left over oils from the day before run. if u can, hold the car in 1 hand, and tilt it at a 90 degree angle, and rev up the engine (exhaust end pointing against the ground..or use a piece of cardboard and hold it near the exhaust tip, rev up the engine, and if there is oil after clearing out the engine. its running too rich.