UPDATE:
Problem found and repaired
IAC valve has rubber 0 ring gasket
Gasket was hard and brittle not sealing causing a intermittent vacuum leak.
Whew!
My 3fe runs like new.
Such a great feeling. Thank you all for your very appreciated posts.
UPDATE:
took cruiser to toyota service
3 days later they could not find anything (i really dont think they looked)
gave back cruiser no charge
upon getting cruiser back i removed iac valve adjusted valve closed reinstalled it
truck idled perfect 650........turned off engine....restarted.....idle...
put vacuum gauge on and checked out perfect vacuum 21in no fluctuation, also checked for exhaust clog....no clog. ruling out fuel pressure because at 2500 rpm it takes off as it should with plenty of power........im breaking down and bringing it to toyota service tomorrow......lol....
a vacuum leak here will almost drive you to the funny farm trying to find it.
does anyone know a part number for a
O-Ring part number in IAC in 91 Land Cruiser 3fe engine
ok problem not fixed..................soooo intermittent
very odd..........
i noticed it does not do it in 1st gear only second and third....right when it shifts to second it boggs down a little until 2500 rpm then takes off as it should....