Hard starting then rough idle until warm

The engine is hard to start in the morning. It will take three tries until the engines starts. Then a rough idle. I must keep the rpm over 1,000 to keep the engine running. I live not far off a major highway. so I keep it over 1,500 rpm until the engine temperature is normal. Runs great then. I also found that if I just turn the key on and off thee times, until I hear the fuel pump run an shut off, the engine will fire up the first time. Still runs rough until warm up. Thanks in advance for your help.