Hello everyone!!!

I am in desperate need of some help to figure out my problem....
here it goes:
I have a 1987 Honda Accorde EXI, 193,00kms, Auto Trans, V6, Fuel
injected.
When I acclerate, between 20-40 km & 60-80 km the gas pedal becomes
very stiff that I can't even press it and the speed stays at 20km or
60km etc. After releasing my foot off the pedal and try to force the
pedal down, sometimes it will finally kick in and go and sometimes its
stays stuck at 20km for like 45 min before it will smarten up! Now, I
have had manyyyyyyy diagnosis' from different mecahnics including Honda
formans and other shop technicians. One told be its the throttle valve
sticking in the transmission (which I find hard to believe) AND this
was the Honda Dealership! The other Honda dealership says it may be the
accelerator cable seizing up, another tech says its the gas pedal
itself, another one says its the fuel injection system, another one
says its the engine, another says the Tranny is shot and the last one
says he doesn't have a clue! I guess after much $$$ spent on diagnosing
the fault, I am a little concrned in spending more $$4 replacing parts
and it not fixing the problem.  Has anyone experience this or know
anything and may be able to help?? Any advice would be greatly
appreciated!!!! Thank you!!!