Have you had the compression of the cylinders tested ? may be low on #2 ,may be worth checking the timing belt for condition etc as is a known fault with this engine, when was timing belt last changed , may have stretched, lost a tooth as you say ,also swap plug to another cylinder and see if the misfire moves to that cylinder ,I can't remember does that model engine have single coils, on top of plug ? if so move that as well, as may just be at idle these parts are breaking down,hope some of this is helpful
Replace no 2 injector as plugs and stuff are seldom the reason for misfires
dirty injectors or injector controls are generally the cause
SOURCE: 99 OLDS ALERO 2.4 IDLING PROBLEM
intake manifold has a vacum leak or other vacum leak hose etc.
SOURCE: 99 olds alero 2.4
I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.
SOURCE: Rough Idle on cold start.
you may have a vaccum leak at the throttle body , the plastic intakes tend to warp at the throttle body end
SOURCE: 1992 Olds Cuttlass Cierra stalling
Check your lockout sensor on your transmission by unpluging it and try driveing it with the sensor unpluged. It should be located on the side of the transmission between the transmission and the fan, under the air filter box.
SOURCE: 2000 Alero idles low and dies when stopped.
How does it idle when you first start or idle when hot.
On the top of the air intake tube there is a small screw which should when screwed in speed up the idle and if it dosent work or it idles fine when cold or warm at idle then its your GEARs are binding up and there's not to much you can do about that ........sorry
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