I'm not normally one to ask questions to the forum since I much prefer lurk/hunt for answers but I've been baffled now for about a week on this one. I've been searching using different tags but haven't come up with a solution to the acceleration problem, or the sticking throttle body.
I'll try to find a way to get datalogs as soon as possible. My tuning laptop is broken :(
'95 1.8 boosted running on MSExtra 2 so CEL checking isn't possible (not that I know of). Car has been running well up until now and no recent work has been done that would suggest cause for either problem.
-Car hesitates/stumbles when throttle is applied. Sometimes dies when I try to come off a light because the RPMs drop so much.
Have already tried:
-Pulled TB and cleaned in and around (I know that wears the bore seal but I'm desperate here)
-Ran the car without boost/intake tract to insure intake blockage was not a problem.
-Fuel pump works, replaced fuel filter.
-Changed plugs (NGK BKR5E11-EGP) and the wires (Duralast) are relatively new and have been working fine for my application, despite the cheap-ness.
-Checked injector o-rings for leaks.
-Car achieves peak boost target (15psi) so vacuum leaks are not suspect. Still possible but hasn't been the case in my previous experience.
-Mechanical timing and spark advance tables.
Have not tried but will, time permitting:
-Checking fuel pressure
Below is a link to a video which shows the symptoms. Sorry about the poor quality.
I'm open to any and all suggestions for possible cause, including ones that seem far-fetched. If any more information is needed, please do not hesitate to ask.
Thanks in advance!