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Hello and welcome to just answer and allowing me to assist you. well it certainly looks like you done most of the right things the right way for an engine sitting that long, kudos to you. If that's all the problem you have is a sticking or lazy air flow meter plate you can use a good throttle body cleaner and work it back and forth till it becomes free then follow up with a little penetration fluid' That would happen sitting that long because of the two different metals corroding together. if that don't work you may have to replace the unit. Hope this helps you and if you require further assistance I'll be happy to do so.
the air flow meter , it should move easy and freely
then I think you may have a tps sensor problem I'
ll send you a good link how to test the tps senor ok let me know how it goes. https://www.youtube.com/watch?v=_skVHdgtMTU
as its a 77 it will be cis. have you checked that the air sensor plate is moving freely? when you open the throttle the vacuum (or the air movement to fill the vacuum in the manifold!) should pull the air plate down and in so doing cause the piston to move in the fuel distributor and squirt in more fuel. if its been sitting a while that little piston and the fine slots that the fuel flows through can get clogged and stuck and you idle fine but cannot do anything else. try holding the throttle linkage open and pushing down on the air sensor plate when its idling and see that the plate moves freely and the engine revs up. if it doesn't its something other than the fuel distributorcheers ***** ***** have a manifold vacuum sensor that tells the ecu to riches or lean the mixture need to check that for vacuum on both sides when revving. the other thing is have you got a timing light to see if the timing advances when giving throttle. I'll send you a pic of the manifold pressure sensor location. check all vaccum hoses going to the throttle body
I'm sorry but I have gone as far as I can not being there is hard for me to feel the problem so I'll opt out so perhaps another expert can shed more light on your issue , good luck.