Originally Posted by eyim1988
And op. it's probably normal. I know some 135 guys are having idling issues where car stalls and revs go up and down on idle after Installing a Catless downpipe
A fluctuating idle and stalling is not normal for sure. The idle should not surge/fluctuate at all. Something is not right. If it happened after the DP install then they need to check for leaks and make sure no damage was done to o2 sensor wires.
I have been catless since the day the AR DP came out. No idle fluctuations or stalling at all.
OP- I would check your connections at the chargepipe, make sure you do not have any vacuum leaks. This will cause idle fluctuations and/or stalling/sputtering.