weird sound when drive 100km/h

[stromplay34]

hi! Bro and sifu

need your advise

my ATR (NA) have weird sound when it reach speed 100km/h.

the sound like misfire (pop..pop). but the timing is ok. RPM no drop.
the sound come from bottom of car.

thanks ....

 

[stutzedward]

if the car is stationary and rev @ nuetral until the desired RPM which is equavilent to 100kph, got sound or not?

 

[kaninbu]

got jerking?check ur plugs

 

[stromplay34]

when the car in stationary position have no issue.
even push the pedal to RPM equivalent to 100km/h.

i had lift the car with four jek, and test run till 100km/h. still no found any sound
it only happen on the road.

---------- Post added at 11:31 AM ---------- 6 hour anti-bump limit - Previous post was at 11:30 AM ----------

when the car poping sound , the engine not jerking.
already check the plug, still on good condition.