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@ Fhemmmy Motors
I should have asked first, I hope contributions are welcomed. The Auto Section need threads like this, if you don't mind I want to be a contributor.

blank:

Pls, i have a problem with my Hyundai Tucson 2007 model. It keeps jerking anything i press down on the accelerator (hope i got the spelling). Lately, it has been getting worse. I have just changed the fuel pump and now it drinks fuel like a V12 engine. Previously, i have changed the injector, i use injector cleaner, i only buy fuel from Total, I do the regular servicing. I have never missed a servicing. I am so frustrated with it. Could it be an electrical problem?

blank:

Pls, i have a problem with my Hyundai Tucson 2007 model. It keeps jerking anything i press down on the accelerator (hope i got the spelling). Lately, it has been getting worse. I have just changed the fuel pump and now it drinks fuel like a V12 engine. Previously, i have changed the injector, i use injector cleaner, i only buy fuel from Total, I do the regular servicing. I have never missed a servicing. I am so frustrated with it. Could it be an electrical problem?

Car trouble symptoms: Car jerks when you accelerate to gain speed.

Car problem diagnostics: When the car jerks during acceleration occurs when the temperature is cold or the engine is cold, this only indicates a problem on the distributor cap. Moisture is formed inside the distributor cap during the night when the weather is cold or when it’s raining. The moisture that forms will cause the engine to misfire thus engine power becomes not even and the car will jerk when accelerating.

Car problem diagnostics: during the night when the weather is cold or when it’s raining. The moisture that forms will cause the engine to misfire thus engine power becomes not even and the car will jerk when accelerating.

However if the problem occurs gradually and as the day passes it becomes worst then the possibilities is that there is problem of vacuum leak. Vacuum leak start small then become worst gradually because of the pressure inside the engine, the vacuum is one of the key factors in determining how much fuel is needed by the engine, if there is a vacuum leak the air/fuel mixture will not be in the right proportion thus making the car jerks when accelerating.

Another possible cause is a bad throttle position sensor, this will be the cause if the problem occurs at any engine temperature and if you encounter the problem constantly since the time you start noticing it but this is only possible for fuel injected vehicle. Throttle position sensor is a device that measure the distance of the accelerator pedal from its original position when you depressed the pedal. The reading of the throttle position sensor will be transmitted to the car computer system to determine how much fuel is injected by the fuel injection system into the car engine. If the throttle position sensor is bad then the data that it will send to the computer will be wrong and will affect how much fuel will be injected inside the engine thus making the jerk during acceleration.

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According to the Experts.
According to what you have written, the bold paragraph could be your problem. With Naija mechanics you have to be specific or they will do trial and error on your car, so maybe when you take it to them next time tell them to check your vacuum leak.
Feedback is welcome so others can learn too.

blank:

Thanks. Will take it back to Hyundai's workshop. U would think the makers should know what could be wrong.

@ Fhemmy, its only on acceleration. When braking its fine.