[Broken-wrench]

Bingo! You have a possible problem. I'm sure you can find more leaks. Get a can of a fluid of your choice & spray around all the rubber hoses on the intake manifold. When you hit a leak, the revs will pick up if you have used a flammable fluid. Do so at your own risk & pearl. I always use starting fluid and have a fire extinguisher at your side, just in case.