ian02s2k

I sure did! Cleaned it out with some carb cleaner, and also cleaned the throttle plate, and wow, no more bucking, and drives and idles so much smoother

slipstream444

TreyDM is correct.
The low speed bucking is due to the fact the S2000 is not designed to be lugged around at low speeds - part of that is ECU mapping and part of that is due to the cam profile. The low cam is still relatively aggressive compared to more tame street cars and if you get caught in slow traffic, you can experience some cam surge.
Everyone already seems to instinctively know how to solve this - push in the clutch and feather it occasionally to dampen out the surge.

dparm

You can clean the MAP sensor if you're certain that's what it is. Likely won't hurt anything.

Go buy a can of electronics cleaner at any auto parts store. Spray the sensor a few times. That's it.

pputkowski

Do you have an intake? Could be heatsoak...

Happens every now and then with my FIPK after the car is hot.

Torqueless

happened to me too. bought new map sensor with the zip tie and i still get the violent jerking in first gear sometimes. usually happens when the engines been warm for a while and its hot out and im idling for a small period like in traffic

hughs2k

this happens to me in warm or cold weather and usually after i've driven the car for awhile.