To Misfire or not?

[270_BMW]

I have a 2002 X5 3.0i with 251k miles and it’s came with it’s fair share of problems but has been fixable thus far. After running for about 30 minutes and letting it sit for just as long... when firing it back up I am getting a misfire code in cylinders 1 2 and 3.

Which you can tell when it happens as the car begins to chug and run rough.

Though after clearing the codes with it running after a minute or two it clears up and runs fine.

Doesn’t happen all the time but enough to be irritating, especially when it dies in an intersection with a car full of kiddos in rush hour.

Mainly happens when it’s 85+ outside. Noticeable when the engine is warm and then is off for a bit and then you get it fired back up. Haven’t had it happen when the engine is cold. Also never happened during the winter when it dips below 0.


Recently cleaned the MAF, throttle body, idle air control.
Hissing sound coming from around the DISA... which I noticed after I took it off to clean everything else. Probably needs a new o-ring. This issue happened before though.

Replaced OFH Gasket and alternator about 2000 miles ago. Had a bad oil leak.
No hissing with the oil cap off so CCV system seems alright.
Just put a new set of iridium NGK plugs in without any anti-seize since it’s an aluminum block.

Any thoughts?