Hi. My girlfriend has a Mazda 121 DB. In the stand he runs quite normal and the engine can be turned up so normally. However, if you try to drive with it, you always have to push the accelerator minimally. If you give more gas he starts to jerk very strongly ( you happen to be in a lowrider car ). We already have the spark plugs, the ignition distributor, the ignition cables, the petrol pump, the petrol filter and the petrol line checks everything. il comes petrol (but probably not enough). We already had the car at a specialist workshop on the test device but they found nothing. At their request we changed the air volume meter, which did not change anything. Now I wonder what else can be done. Does anyone have any advice for me? mfG Findus