Hi since last week i've had this high idle problem on my manual neon 2003.
rev will fluctuate between 800 and 1500 when the car is hot (after about 5 minutes of driving) but mainly stay at 1500. When i'm about to start the car i will always have rock hard brake pedal, until the car starts it will be possible to press it, as opposed to before the idle problem, my break pedal was smooth before start up. The engine light turns on about 2 seconds after i light up the car. now im not a mechanic at all i've never done any kind of repair, i have no idea how to do an oil change, and dont have a tester to read codes. i've read this in another forum: "probably a vacuum leak and if it's the main line to the power brakes, that will give you hard brakes and high idle." Does that sound like its the problem i have? if so how do i check for leak in the main line? maybe someone could supply me with a picture of what the main line is? Also is it safe to drive my car? i havent been using it for a week in fear that it will die on me. please help me out. thank you

 

Even before I read what you thought it might be I all ready knew what it was. High Idle+Rock hard brakes=vacuum leak in brake booster line. It's that big honkin rubber line from your booster to your valve engine. It's safe to drive as long as your okay with your engine running badly and having no power brakes.

 

this is what it looks like under my hood
http://www.cardomain.com/ride/222208...ge-neon/page-2
could you point me to where the brake booster line might be? (maybe circle it on a screenshot if possible). i dont know what the booster or the valve engine is

 

heres a pic of the booster and where the vacumn check valve is located(its just behind where u add the brake fluid)
If your unsure where the booster is may I suggest you dont go monkeying around with the brakes? just do a visual inspection
In this pic the master has been removed
http://