Have the codes pulled. Even if check engine light is not on. Sounds like possible iac .
What does scan data show ? Do you know what that is ? What do the fuel trims show , is the computer adding or taking away fuel ? Are the O2 sensors switching normally ? EGR valve stuck open . When you replaced the IAC did you clean the passage ? On a scan tool what are the IAC counts ? Is the the PCM controlling it .Did you clean the throttle plate ?
007 Idle Speed Problems Scan Data for Idle
SOURCE: 1993 Saturn SC 2 starts but wont stay running
Engine coolant temp sensor, If you pull it you will be able to see if it is cracked.. I don't know why but the original sensors they designed the ceramic tips crack around the tip of the head.. It will make the car nearly impossible to start smoke when cranking the engine, and idle really rough racey infact. 15 dollars or so let me know if that worked for you
SOURCE: 98 saturn SL2, P0172 and misfire dtc's, jerks when
Possible blown head gasket. Big problem . Have that checked immediately by a engine coolant pressure leak-down test. You can lose your engine and pronto! Small amount of coolant possible passing into crankcase or/and the cylinders.
SOURCE: 1992 Saturn SL2 stalls after running about 5 minutes
my only guess is a vacuum hose leak. possibly a loose air filter housing, or the mass air flow sensor. look for any hoses unplugged. if nothing is noticed, try cleaning out your fuel system. if that doesnt solve it, then it would be something an experienced mechanic would have to come and examine it personally.
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