Bucking when in idle and drive


New Member
Mar 13, 2023
I have a TJ year 2000 4.0. it starts fine, then when you keep it on the brake and put it in drive it starts bucking. Also if you reverse slowly with your foot on the brake it does this. Further if you drive at constant speed around 1500 rpm if feels the same. Recently the sparkplugs have been changed so we need to check those. Today I changed the TPS and MAP sensors with no result. Further I put some injector cleaner in it.

Does someone understand why the problem comes when you put it in drive? If you put it back on neutral after that the bucking remains.

Next thing I will try is cleaning the IAC sensor.

thanks a lot in advance

Thank you for your help.

Thank you for your advice

i cleaned it thoroughly. With electric cleaner and a toothbrush. Also the throttle body itself. Unfortunately this did not solve my problem. There are no fault codes.
  • Wow
Reactions: TheBoogieman