Any air coming in past that MAF sensor. The box right behind your air cleaner which has a black connector coming out of it is going to make your car idle funny. I have the same problem and i can't find it.
Propane is the best leak detector because it will make your car stop idling funny instantly. But its expensive and dangerous to use. its best to brake cleaner or something else
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Its broke, it could be anything, and cost of repairs will greatly exceed the value of the car
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