Hello Car experts.

My Toyota Picnic Jerks.
Been using the car for over 10 months now but just noticed it's started jerking when I'm accelerating from gear 3. It smoothens out when its about 100km/hr but starts again when I change to lower gears to "speed" up again.

I suspected the plugs as the jerking started after a visit to d car wash to clean the enging- but that was some 9months ago. 3months ago, I had the mechanic replace the 4 plugs as he did not know what d problem was. But still the jerking has nt stopped.
Just this morning, a driver told me that his former boss had similar problems some years ago and the solution was " cleaning the nozzles in the injector"

What exactly is the solution please?

Things that you need to check

The plugs, the fuel pump, the air filter and lastly try to check your gear box oil

Hope this helps

tnx