Sputter after flooring gas
 

Have been searching and haven't exactly found identical symptoms.

My x5 is a 2004 3.0, recently had idler pulley changeg with new belts and new alternator.
While driving if im flooring it or just speeding up it'll kind of go limp, and idle begins to sputter and will lose power (pickup and can no longer speed up). I've revved engine while in park and no sputter only happens when in drive.

So far I've checked belt, and am currently about to clean maf and have checked for leaks in exhaust as well.

Has anyone had this happen? Or insight?

My 328 had a failing MAF, same symptoms. No check engine either.

you may be right, im cleaning it tonight

Might be fuel delivery too. I'd dump a bottle of "Techron Concentrate Fuel System Cleaner" in a full tank of gas. It won't hurt.

Could also be a partially clogged exhaust system or Cat. An engine will rev freely if there is no load, but when you place a load on it, it will not rev freely.

Cleaning it, did not do shit. I borrowed a friends, and tried it out. No more problems, so I bought a new one.

Cleaned maf and so far so good!

Nice. But it's borrowed time in my opinion. Start looking for a new one.

Could also be vanos seals especially if its cold out.

the saga continues, changed maf and that helped, now symptom has returned and car shuts off, am attempting to clean icv today as well as check for leaks