ignition system

I do not understand what kind of crap on cold start up a spear floor works like a clock when peregazovke smoothly and clearly changes the pace but as the warm-up begins podtraivat and when you press on the gas pedal starts to choke and run rough sometimes pops in the exhaust system, which is time may stall, and it was then re-start the engine problem at all and will stand 3-4 hours start up without problems and as it starts warming up snova.I this garbage started after the machine in winter that year stood at garazhe.Mozhet who faced the same problem.