P1124 refers to a lean condition at idle. Since you repaired your intake
leak with some rtv without removing the intake manifold-- that was my
impression upon reviewing the P0303 thread-- you probably still have a
small leak there that's not enough to generate a misfire.
Since we've already established an intake manifold problem, I'd recommend
starting with replacing the manifold gasket and then clearing the lamp to
see if it comes back.
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