Has new oil & filter oil levels fine when the car is warm sometime the oil light comes on when it drops below 900 RPMs and the oil is 10w30
U could have a oil drain clogged in the head or the engine is about to give up. try 10w40 and a quart of lucas oil stabiliser.
SOURCE: rough idle on 1990 saab 900 convertible, 16V
Because the car has adaptive technology, it may take a while to reset and adjust to the new, cleaner and better conditions than those to which it had previously adapted.
Did you change the cap and rotor? if the plugs needed replacement, likely they do too
Possible other causes include:
loose or corroded connections to any electrical component you disturbed (make a checklist and tick them all off as you check them);
mis-reinstallation of any F.I. part disturbed(checklist again)
obstructed water flow through the AIC valve;
improper voltage output from the AIC valve (for LH 2.4 systems, should output 8 volt at idle, dropping as load increases; for LH 2.4.2 system output 7 volt at idle etc; testing between terminals)33 and 17 at disconnected LH connector;
possible problem with MAF.
Hope this helps
Saabreur
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