Hi, I tried to search the thread about rough idle but I couldn't.
I install PFC couples days ago.
My car had up&down idle either engine is hot or cold.
When I start my car, rev up to around 2200 and drop to around 1000 and start idling 1000-1200 up&down for around 15 seconds maybe more and settle down.
Whenever I stop my car, idle starts to up&down for 10-15 sec or sometimes more, and settle down, whether engine is warm or cold.
Sometimes, when I stop, I got correct idle but not quite often.

I think I did proper idle learning process. follow all the process.
Currently my car has intake downpipe-midpipe-single catback and PFC
other than that it's mostly stock.
Is there anyway to solve this problem?
should I redo idle learning process? i tried one more idle learning process tho.

Thanks

 

Most likely cause by too much air flow throught the throttle body. Close the air adjusting screw fully clockwise. Should be around 2 - 1 turns. Then back it out 1/2 turn less than before. If it was closed, then the throttle adjusting screw might be screwed in too far.

Those two are the only manual adjustments for the TB.

Fine someone who knows how to adjust idle speed on a FD.

 

Thanks

Ive been follow the pfe idel thread here. I just increased idling numbers and i barely see unstable idle.