two scenarios on an induction leak:
1. when I bought my car I gave a good look and never noticed until I pulled stuff off to change out the tranny that someone had bent over a portion of the rubber collars that go onto the throttle body. the bent over part was on the inner/lower side, and couldn't be seen by simple inspection. so, might want to pull the tubes just to make sure unless you're certain they were put on proper.
2. one of my kids just found a crack in the plastic intake pipes for a 93 ford probe. it can happen with heat & vibration.
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