more hesitation
Well i hope you guys have fixed your hesitation problems by now, i see this thread is a few months old.
I've got exactly the same problem. Its a 91 Auto, dip into gas from a stop and there is no-go for a tiny second. there is no matter of temperature. easy take offs make you think there is nothing wrong with it.
here's where i've been and whats going on.
engine rebuild a couple years back, car isn't driven daily and don't recall when this problem started.
tried cleaning TB with a rag, i still have the sticker that says "do not clean..."
exchanged: TPS, IAC, MAF
New plugs and wires, old ones weren't looking too good.
Sealed all IC tubes with teflon rings from Tbird88.
Found deteriorated vacuum line between PCV pipe and vacuum hose that goes towards fender. put clamp on side that connects to inlet plenum.
No EGR on this car
I have replaced air filter, and have a fuel filter which i haven't put in yet.
Replaced gasket from intake elbow to intake manifold
Replaced TB gasket, and resealed inlet plenum to rear of SC.
With a rubber hose in my ear (haha) i could and still do hear some "air" sound from the back of the SC. I thought it was from where the inlet plenum connected to SC, thats why i resealed it (used IndianHead gasket sealant). After i put it all together sound was still there so i compared to another SC and heard the same sound, that car runs fine.
I've got no KOEO, KOER, or KAM codes.
O2 sensors are newer.
Car idles at around 17-16 inches of vac. in park and about 13 or so in drive.
other than this issue car runs very well.
I'm up for smog, (california) about 2 weeks ago. I think it could pass, but almost don't want to spend the money because i don't have it.
thanks for any help
jim
EDIT: almost every item was changed separately and throughout I noticed about no change at all.
Also at one point even the ECU was exchanged.