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Originally Posted by twingles
If there is a leak shouldn't the CEL come on? It also seems to lose a lot of power when defroster or a/c is on.
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no not always.. I think there are 4 connects to the manifold plenum area. I take a look at those 2 small hose One larger and maybe another back along there although it will be eaiser to find if the cowel is off.. But it sounds like you have a vac line loose somewere. It will loose power if you add the ac too the loop because it is already running rough. I think the 2 small thin line that connect to a check valve that goes to the intake plennum may be the problem. if one came loose.