Our MH is about the same vintage as yours and our VIM is black and about 8" square. Based on the way that ours is wired, the VIM shouldn't be too far from the TCM. My VIM was causing me a speedometer problem but, based on the electrical logic in ours, I cannot imagine how it would cause a starting problem.
The functions that our VIM performs are related to the exhaust brake, etc. If you really need to find it, perhaps you can talk to someone at FCC and get them to give you a point the connects to the VIM that you can find (I started with the ECM) and then physically trace the wire from there. It isn't as difficult as it sounds.
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2000 Georgie Boy Landau 36' DP
2018 Equinox toad
KF5-NJY
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