I have cultus 2008 efi, running on petrol. The issue is the car is taking jerks in all gears. The impact is more in low gears 1 & 2. Have to slightly press clutch to minimize the impact in low gears. Mechanic is saying that this issue is related to electrical system/sensors.
Yesterday, changed oil with shell 10w40, oil filter, air filter as well. Changed all spark plugs to DENSO as it was due. But the jerk problem is still there. Plug wires replaced two months ago along with throttle service, and changing of IAC valve.
Another problem is rpm dropping issue which appears at random times. The car mileage is 7-8km, emitting black smoke, engine driven 150k+. No use of ac during these issues.
Your response will be highly appreciated. Regards,