96 saturn takes 10 min to start on warm engine

Fuel pump is bad.

Have you changed the spark plugs for new ones?

yes
try having the fault codes read to determine the fault area
indicates a problem ambient temp sensor, problem BARO sensor or faulty MAF/VAF sensor

There's a shutter valve to restrict air flow either before or after the air filter housing. In cold winter, this valve is closed as you start up the engine. As the engine area warms up, the shutter valve opens up to allow more air to flow into the intake manifold. In close position, the restriction in air flow results in rich fuel mixture. When its open, the fuel mixture is leaner. If it were locked in open position, you crank the cold engine and you get a lean mixture instead of a rich mixture to start up in cold mornings.

Coolant getting into #1cylinder could cause this.

TO WHOM IT MAY CONCERN:
My car will not idle properly until after it is warmed up.(1995 Olds. Cutlass Supreme 3.4)
It wants to idle up and down between 1000 and and 2000 and will stall out if I don't keep it revved up at 2000 until it warms up.
Thank you and have a great day.
Betty

check timing and depending on miliage check your ignition system

It was the coolant temperature sensor. It was telling the car that the coolant was always cold, therefore when starting a warm engine it was being flooded. $$$

take it to a volvo dealer and have the codes read
most likely a coolant temp sensor, ambient temp sensor, Baro sensor, MAP/VAF sensor problem the fault codes will tell you

The thing you need to do is run a leak down test on the fuel pump overnight, hook up a fuel pump test guage to the fuel injector gas rail test port, run the engine, note the fuel pressure when you shut the engine off, it should not drop more than 5 PSI overnight, if it does you need a new fuel pump. Your car doesn't use a cold start valve, that was used on very early Bosch K-Jetronic fuel injection systems, they where last used in the 80's