Unusual start up abnormaliti

[AV8R4AA]

On my2003 4.6 V8 engine. Sometimes it will crank, rev up then drop down.
But every once in a while, it will drop down so low that it stalls out.
Starts right up after that. Seems to happen when temps are lower. No check engine, no codes.
Any ideas?

[getty150]

I'll suggest the investigation of the car battery...how old is it? And have you ever put it on the charger?

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[X5chemist]

Sounds like extra air entering the TB. Tighten up the intake hose clamps and check for cracks.

[AV8R4AA]

Update

Found a broken off nipple on the intake tube. After the MAF.
Unmetered air BAD! Good call guys.