Hard to tell but is sounds like a vacuum leak or a resonance in the AFM. Take the air filter out and the top off the air cleaner and see if it is in there. Another thing to check is the vacuum hoses that go to the thermo valve that is on the right angle water outlet on the back of the head under the intake since it seems to be temperature related. IIRC that valve actuates after a couple of minutes.
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Steve Potomac PCA Co-CI(retired)
89 944 Turbo Race car
85.5 944 NA son's 2015/2019/2020 944Cup and PCA Nat'l Champ racecar
94 968 1 of 11 Iris blue coupes
92 968 1 of 2 Tahoe Blue Cabriolets
98 993 C2S w/Aerokit II
77 911S Vintage race car project
70 Boss 302
86 Mustang SVO
24 F250 SD Godzilla
"Noel spun! Noel spun! Don't do anything stupid, Dad." -the boy on the radio on the last lap of NASA race as the second place car spins behind me in T5 at Summit Point.
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