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This should be a drive by wire vehicle meaning it has a cable for the throttle body. First thing would be to see if any error codes can be pulled up (most parts stores will do that for free.) Drive by wire versus the late model that use electronic control for the idle have a IAC or idle air control which when first started controls the idle air intake--all air is run by it to idle the vehicle when cold--
Usual symptoms are rather high idle when cold engine or even idle and RPM jumping up and down and stalling when cold.
Another way if idle does drop when cold is tapping the gas--engine will still run until hot. Means not usually a fuel pump issue.
You could also have if the vehicle is fuel injected a dirty Mass air flow sensor, a throttle position sensor, etc.
These can be if the vehicle has them cleaned using a special zero residue spray cleaner.
First have it scanned to see what if any errors it shows--the computer.
This may be due to a bad coolant temp sensor or bad idle air control valve but i would have the computer scanned for codes, the codes will tell you why the engine light is coming on and i think thats why it idles high, the codes will help alot.
Hello, I have 1996 Ciera with rebuilt engine pretty new, also fuel filter and fuel pump replaced but I have a problem, the car starts and runs well cold but once car has been running for a few hours, either stopping or coming to a stop it starts to idle roughly and has come to a stop at different occasions. Check engine light does come on and off occasionally. Can you help?
1- check for codes with scanner to see why check light coming on. 2 unbolt exhaust before caterlic convertor. Run car to see if still does it.If it does not the caterlic converter is the problem.the car temp should not go over 220 degrees. if car is getting to hot it will shut off,check cooling system and cooling fans to make sure they are comming on. Also if water is flowing through thermastat.Map sensor when gets hot could cut out. some places to look. doug