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I have a 2001 mazda sp20 with 80000 ks, i have had no problems with it in 5 years but recently when i have been cruising along and take my foot off accelerator to let engine slow naturally instead of braking and it sometimes sounds like its going to stall , plus a couple of times it has stalled when i come to a stand still and put it into N or P, i get oiled and filter changed ever 10000, i do run it alot of the time on 91(which is what garage told me when i bought it ) some one told me they think it should be 95 ? ,.i have'nt had spark plugs done for a while any ideas ?
Thanks

Possibly, one of the intake pipes has a leak which can cause the same symptoms. If some of the air bypasses the airflow meter, due to a faulty pipe, it can cause the faults you have described due to an incorrect airflow reading.

Other possibilities are a faulty airflow meter, low fuel pressure or the vehicle could need new service items such as the spark plugs and air-filter.

My information states this car should run on RON 95 octane petrol or higher.