At a certain speed my car jerks (around 30-40 km/h) and I can feel it the most in the morning. I always warm up my vehicle before driving it. Please help!! Thanks!

 

you need to tell us about your car, though. 5th generation or 6th generation? Which trim level? Any modifications? Mileage?

 

Lol!

Its a 92 Civic SiR with B16A engine (118K km). Did some tune up (except the fuel filter and PCV's) and timing belt and water pump change recently. Car is stock except for the aftermarket Air filter.

 

Not enough info.
At the very least you need to give vehicle info. When was the last time you did a tuneup?

And be careful who you listen to. There are a lot of people on this forum giving advice that can't even perform basic maintenance on their own vehicle or identify parts of it.

 

Read the rules sticky, then try again.

 

Last tune up was about 2 months ago (around 115k km, right now its 118k km)

 

cap, rotor, plugs, wires? Fuel filter? Air filter?

sorry didnt see the edit.

 

Vehicle info i posted above. Replace cap, rotor, plugs and wires except fuel filter (can't find the fuse) and air filter which is aftermarket.

 

So it just started doing it?

 

like it was said. not enough info. to little info. when did it start etc. come on man get in the game and follow the ball stop space dreaming

 

Actually I forgot went it really started, but probably a month ago... Ohh I remember after I change the Speed Sensor which is a month ago.

 

I cant imagine how a speed sensor would cause this. Maybe you should try exchanging it anyway?

 

There are so many possibilities, I find a video best.. take one, youtube it and post it here?

While you're pressing the gas,
Is it jerking back and forth, or does it just feel like it's cutting out like a rev limiter? (this is often caused by bad plugs, spark plugs, and sometimes the distributor cap having a crack/leak.)

If it's jerking back and forth it's more likely fuel related, so we're talking fuel pump, injectors etc.

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Does the car turn to one side when it jerks? try letting go of the steering wheel and check, could be a lose arm at the bottom even.

 

Funny thing today. It was raining here and didn't feel that jerking.. more to follow..

 

My eh2 with a b16 had same issue. It was fuel, cleaned my injectors and then found wiring issues with fuel pump. check everything and write down what you've done & when and keep with your Chilton/Haynes, save time researching the same damn thing over & over

 

Misfire can cause jerks so can bad sensors, tps,map,iat, big enough intake leak

 

Sounds most likely like a misfire OP although a video would be extremely helpful. Additionally, if you turn on extra electrical things like lights, AC, windshield wipers, etc, does this get better or worse?