| To describe an intention in the past: |
| I was going to suggest dinner together ... another time perhaps. Oh! I've forgotten what I was going to say. |
| For a change of plan: |
| I was going to go there last summer, but I couldn't get away. I was going to give her a Porsche but it turned out to be too expensive. |
intention in the past
Compare with an intention in the present...
change of plan
You can also express this idea with the Past Continuous...