[B58Vinny]

Originally thought this idle surge I had going on was from not replacing Spark plugs and coilpacks as My 340i sits at 60k miles.Replaced both of those and after the car has been sitting for 8+ hours.It did it again.Car will idle for a min then rpm’s will drop then Almost shut the entire engine off and kick back up to catch itself.It is on stage 2 but this was happening on stage 1 bm3.Disabled Gts Startup and thought it fixed it because I noticed the car did not like it but now I’m stumped.Vaccum leak? Dirty Maf sensor? Battery replacement? Fuel injector issue? Please help

[thejeremyman9]

So it's a cold start issue? Did you disable cold start?

[B58Vinny]

I kept it on oem was I supposed to take it off.And it happens on cold starts and when the car is up to temp idling

[thejeremyman9]

OEM is good, just checking. Usually disabling cold start causes problems. If you are on OEM cold start with raised ldle and still have a problem you can just unplugging the MAF and starting it and see if it still happens. If it does, smoke/pressure test might be up next.