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Ok I'll start with the things I've swapped:
DI
new plugs
throttle position sensor
intake temp sensor
checked bypass valve
checked compression all very good 170+psi
It is worst in wet/humid weather. It only misses under very slight vacume or slight boost. Under full boost it is generally good. If the rpms are low the car will bog in 5th gear from 1500-2000, I mean worse than usual. Gas mileage seems to be down. Due to the wetness factor I'm thinking it has to be elelctrical but I'm not sure what else to check. I've hooked up a multimeter with a scale from 1-10v to my O2 sensor and its hard to tell but the mixture looks pretty good, full boost holds steady rich. If anything I would say that it is lean durring this hesitation but its not obvious and hard to tell while your driving.
Its hard to describe this but it feels like a DI failure, if you accelerate as slow as possible under load the rpms kind of stall, like they are stuck right at atmoshpere presure. I first thought it was a sticky bypass valve that wasn't closing cleanly. I've now gotten to the point where I'm thinking injectors or computer. I've also packed almost all connecters I could find with dielectric grease. I'm at the point where I might... I might... take it to... cough cough... the dealer...
any help will be appreciated. I posted this a few weeks ago and Aeroguy gave me some things to check. At that time we were leaning towards injectors but the O2 sensor isn't leading me that way.
1997 Aero 5speed 97k miles MA,USA
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