Stop guessing about what it "might" be.
Go back and read all the responses to your musings and questions. Hoonk (and me) have given you some simple, real, things to check in this, and other, threads.
Until you've done that (and my money is still on cracked or improperly installed intake pipe), all the musing, wondering, and posting, won't get you any closer to a running car.
Get a mirror, get a flashlight, and check.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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