s14 idle goes up and down from 937 rpm to 850 rpm

[rb25crazy]

hi guys

I was wondering if you guys had any ideas on why my idle is loopy it does this...

s14 idle goes up and down from 937 rpm to 850 rpm..

the only change i did was remove my aftermarket 2.5" exhaust and put back old stock one... do you think there could be back pressure issue or something?

[DoobieS13]

Post in tech thread and Google
And there is not a back pressure problem unless you have an exhaust leak. ps when u do post this in the right section, you may want to give more info like what motor and ish.