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In my Toyota Vitz 2007 (automatic transmission), I have facing a problem for about a week now. The problem is, sometimes when I press the accelerator, engine revs up but car does not accelerate much.

If I release the accelerator and pressed again, the vehicle catches up and accelerates. The problem is more apparent when I am going up a hill.

Also, there had been another problem for some time now, that is, when I accelerate from a complete stop, car sometimes accelerates with 2 or 3 quick jerks.

I have changed transmission fluid about 20,000 km (about 2 years) ago.

Is it possible to check transmission fluid level in my car? I can't see any dipstick similar to the one for checking engine oil level.

Also my engine wiring harness has some problems and I have soldered several broken wires. Mostly due to this, the car idles roughly. I am looking for a new aftermarket wiring harness these days.

Could the wiring harness problem have a relation to the acceleration problem?

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Could the wiring harness problem have a relation to the acceleration problem?

Possibly, if it is an electronic transmission

Is it possible to check transmission fluid level in my car?

Not familiar with that model but some can only be checked if the vehicle is on a lift, manufacturers have started removing the usual transmission dip sticks and replacing them with really short ones than can only be accessed while on a lift.

Slipping of an automatic transmission is not good and will do further damage if you keep driving it.

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Is it possible there is problem in your ignition system. I think there is conduction problem on your spark plug which is placed on the engine.

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