Hi,
In all honesty these problems all sound familiar to what I have had over the past decade with my own 1989 K-jet 2.0.
Check the condition of the six connections in the plug that the fuel pump relay plugs into I ended up replacing the six female spade connections in that plug and starting/running improved greatly.
Also replace the vacuum line that runs from the throttle body to the distributor this had perished on mine and went unnoticed for years once replaced behaviour improved.
Hope this may be of use.
Scott
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