If this has been discussed before, forgive me; I tried searching and didn't find anything related.

So I'm fuel tuning a stock '94 Roadmaster wagon and a stock '95 Caprice 9C1 and I notice that BOTH of them have the right side BLMs always 1-6 counts higher with open throttle. With closed throttle decel situations or under 5% throttle, the BLMs reverse, and the left side bank is higher. Before I go chasing fuel injectors or the idle air ports underneath the manifold, is this common?

Any benefit to blowing some solvent into the idle manifold to clean it out? (Manifold removal is not in the cards at this time).