You have a intake air leak. The engine revs when the starting fluid get sucked in through the leak.
This almost surely indicates a vacuum leak at the elbow. Get flashlight, look at the elbow. Is the elbow or the vacuum line crumbling or cracked? Spray starting fluid right at the elbow while you look at it, does the idle go up?shaolinpat wrote: ↑17 Feb 2019, 15:31 I sprayed carb cleaner around the engine. I put some down by the left side of the intake manifold (as I'm standing in front of the car), and that changed my rpms some. I really couldn't see where I was supposed to be spraying to get to the so-called "evil elbow", but was spraying where I thought it was. ...
This almost surely indicates a vacuum leak at the intake manifold. Was the PCV recently surfaced? It is super common for the little metal bracket on the corner IM bolt to get wedged under the manifold when finishing up a PCV job, and cause a vacuum leak. It is also somewhat common for the intake manifold gasket to fail in this area. Like above, get a flashlight and look carefully to pinpoint the area where starting fluid makes the idle surge, is it where the intake manifold meets the head? It's going to be either the manifold or one of the PCV lines underneath it, or possible the vacuum tree. If the IM gasket needs to be replaced this might be a good time to do the PCV also.shaolinpat wrote: ↑17 Feb 2019, 15:31 ... I also sprayed under the top side of the fuel rail, and got quite a lot of engine reving just to the right of the fuel cap. ...
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