So, ive begun to notice that on a cold start, temperature doesnt matter, does it in winter temps and summer temps. when i start the vehicle and the idle will work its way down to where it should be, i can feel the motor bump/bog/hesitate or whatever the hell you want to call it. no abnormal engine noise. everything else is fine. once car is warmed up and idle is down it wont make the bump/noise. i have looked at a few others at work and have not come across this yet. all i have done is a gms1.


thank you!!

 

its an 09 ss tc