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Check engine and check gearbox on an automatic...neutral safety switch is going out. First couple starts like that and it seems like it's in limp home mode...it is. A few more starts and it will reset itself. Mine did so reliably at the 5th restart until I changed it.
Get a used on if you can, they are not really rebuildable reliably. Pain to change, it's under the battery tray and miserable to get to.
Have the catalytic convertor checked, sounds like it may be trying to stop up. Some cars have an exhaust vent between the exhaust manifold and the exhaust pipe, it could not be operating properly. The purpose of this piece is to help the engine warm up in the winter to get the heater working faster. Most of them are vacuum contolled and the vacumm line might have a small hole or the cast iron unit is old and just stuck. you might free it up if you can get it off to work with and lube and replace on the car.
the ac is a gas leakage problem and can be fixed by an accredited ac specialist shop
the exhaust gas smell could be the flex pipe at the exhaust manifold or a exhaust pipe gasket that has failed ( come loose after the engine replacement)
as for the engine lights , it con=mes on from reports from the engine and the transmission so have the fault codes read to find which sensor is reporting a fault
could be that same sensor that reports on the exhaust problem
hard to start is an electronic reporting fault and that will be in the codes as well
you may have blown the head gasket.
check the coolant level,is it low?
if it is ok,check the fan switch on the radiator,change the thermostat,and check that the fan is working.
the fan has to work,saab engines run very hot.
there is a after run fan switch as well that measures engine compartment temperature,and can start the fan even with the car off,so be careful.
I own a 99' 9-5 V6 turbo SE. Had the same thing. Started smelling gas in the car, sometimes. Instead of not starting it died (as in the engine stopped) on a barren stretch of road at night. Towed to the Saab dealer: Conclusion? Replaced the fuel pump and sending unit.
Don't ask how much.