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The one on the opposite side I believe is the upshift delay solenoid. This delays upshift when the engine is cold to help warm up the engine and specifically the catalytic converter faster. POSSIBLY this is why you have these delayed upshifts, does it do this ALL the time or just for the first 5 or so minutes with a cold engine (in the morning for example)? If it does it all the time the fault could be with the throttle valve assembly (which includes the upshift delay solenoid), I've seen this before. Not sure why I'm not seeing the adjuster on the vacuum modulator, maybe they deleted the adjuster and I never realized it.
The upshift delay solenoid should also have the cable running to it from the throttle linkage as well as the vacuum hose. I've never had a problem with the switchover valve for the upshift delay, usually the part on the transmission (the solenoid itself) sticks or stops working, but the other parts are a possiblity too, or the throttle valve cable is out of adjustment.
Gilly
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