Ruff Idle

[tezflow]

hi guys,

my bro just bought a 33gtst,and after starting it the second day of owning it ,the car had a ruff idle and was reving itself from about 600rpm to about 2000rpm.... after takeing it for a drive it was fine apart from being a laggy in the lower revs...what could have caused this? thanks .

[Abo Bob]

Vacuum leak most likely. Check all the little hoses for splits or maybe one has come right off. Also check intercooler piping and connectors for leaks. Basically an air leak somewhere in the system.

You can often here them when the engine is idling or if you give it a little rev while you head is under your bonnet.

[jasont82]

is it running a stock ecu? mines like that on wolf 3d. cold start needs to be tuned again for the third time. once its hot its fine but is annoying at the lights.

[Dose Pipe Sutututu]

AAC valve, give it a clean.. it's rev hunting.

[d00dz]

AAC Valve Cleaning DIY Tut