on a drive home the other day the car started to idle very rough, did not react well to throttle changes (engine surged up/down in rpm) and stalled every time i came to a stop. cel light came on. put a evoms air intake in about 2 months ago with the fister exhaust w/o problems until now, had the 60K service done around 66K last fall and have only put 800 miles on since. any ideas?? '00 996 cab.

 

Did the filter get wet? I know when i first put my K&N in,on a good rainy day or a car wash if enough water got on the filter the car would run like crap till the filter was dry. Also could be the oil on the filter is all over your mass air flow sensor and is not reading correctly. I changed mine to a AEM Dry Filter.

 

You might have an air leak on the induction side, that can cause these symptoms
Regards Lee

 

looks like the problem is fixed, the hose clamp came off the air intake at the throttle body and the connection to the EVOMS unit came out of the hose. cleaned the MAF, disassembled the EVOMS unit and reassembled everything. runs like a champ now. had to disconnect the battery to clear the CEL. hopefully this takes care of it.

 

Glad to see you found the problem and thank you for the follow up. Keep us posted if it happens again.

 

Hey man,

Funny I did the exact upgrades that you did also ... Evo intake with the Fister exhaust (car sounds amazing!) .. but I have been getting a CEL light ever since ... Many people told me I need to tune the computer now because of the air / gas ratio has increased ... and the stock computer doesn't know whats going on ... I just wrote a post about it tonight explaining my problem, looking for some advice also ... my car wasn't stalling but when I cleared the codes on the CEL .. was getting rough idle ... not steady .. going up and down a bit when cold ... when warmed up got a bit better but still wasn't as steady like it used to be before upgrades ... check out my post for a more detailed description ...
Good luck!