Phil, You were right on about the broken wire. It was the black wire that goes to pin 2 the ground, almost did not see it old eyes. A little peace on insulation was holding it together. Look like 22G solid wire and we all know what happen when it gets bent over and over.
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It's exhaust manifold. There are two manifolds, the intake manifold in the valley between the cylinder heads, and the exhaust manifolds, one on each side of a v figured engine.
And, yes, a leak in the exhaust or the intake will make it run lean. If the leak is close to the engine, it can do harm to the valves, too. There is a gasket between the exhaust manifold and the engine block. Likewise, there is an intake manifold gasket between the intake manifold and the block.
could be just head gasket and bad exhaust manifold gasket (coolant leaks past head gasket into exhaust port then leaks out of exhaust manifold gasket) or it possible that head is cracked too Only way to know for sure is to remove head and inspect it
There are several areas to check for possible exhaust leaks. i will list them below.
1. Exhaust manifold gaskets - This will be the most common area. There is a gasket that separates the block from the exhaust manifold. these gaskets can fail, thus, causing a exhaust leak at the manifold.
2. Lower manifold gasket(donut gasket) - This will be a possible leak spot as well. This small circular gasket is placed in between the upper exhaust pie and the lower side of the manifold. It basically separates the pipe from the exhaust manifold.
3. Exhaust pipe - The entire pipe can rust overtime, thus, creating small holes along the pipe structure. These holes will cause the exhaust to leak ,thus, filling the vehicle will moderate fumes and causing louder than normal engine sounds during revving.
4. Muffler - This component can also deteriorate to the point that it cannot filter out the noise. It will also cause leaks as well.
You will find the leak in one or all of the areas stated above in the list.
Quest#1 Your intake manifold is leaking
Spray carb cleaner while running at intake manifold gasket , both sides, and check for a difference in running condition while spraying to confirm leak here. Replace all intake manifold gaskets and plenum gasket.
If this does not confirm intake leak , have the Throttle Body cleaned manually by a professional, or yourself using specifically" Throttle Body Cleaner "