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First, this "solution" assumes that the engine starts and runs OK, but will not idle once the key is returned to the RUN position.
A real common cause of that is the Idle Air Control Solenoid (IAC). To see if this is the problem, see if you can keep it running by stepping on the accelerator a little right when it is starting.
NOTE: you don't want to step on it before you start cranking the engine over or you will flood the engine. Also, step lightly, just enough to see if you can keep it "idling".
If you can keep the engine idling this way, then replace the IAC.
If this does not work, try unplugging the MAP Sensor and see if it will start and idle. If it continues to run (idle) with the MAP sensor unplugged, then replace the MAP sensor.
The next thing to suspect if none of the above works is the ignition switch. If it gets this far, post a comment to let me know and I'll post some instructions for testing the circuits for your ignition switch.
Surging is usually a vacuum leak, look around to see if a vac hose was knocked loose during the sensor installation.
Start your car and let it idle.when it starts doing its "thing" turn the heater/ ac selector to off.However for further advice clean all the sensors free from soot, starting with the MAP sensor, then to the 02 sensor, and the idle adjustment valve. disconnect the battery prior to it so that no voltage spikes may damage the ECU.
check the ignition timing if it is set to the specified degree. Next, check the idle valve to make sure that the proper engine speed is reached while idling.Adjust the throttle cable settings to get rid off the slack. After doing so, the RPM should seem great.The engine should come to life and almost straight to the specified RPM.
For hard starting in cold weather.. Try using a winter oil (5W-xx or 10W-xx) and run a tank of super unleaded through it.
run gas line antifreeze in tank if it's really cold, also if you have fuel injection it may be a faulty temp. sensor, if it's a carburated vehicle it could be the atomatic choke not working as it should, but yeah 5w30 oil is good for the cold season
Thanks for contacting fixya.com
engine coolant temp sensor is most likely cracked.. I know it sounds strange but pull it if your looking at the engine it is on the right side of the head Will make the car hard to start, smoke, and the idle will often race up and down.. easy to fix 15 dollars or so..
I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.