Installed an ebay cold air intake about 6 months ago. Ever since car has had high rpm's. I idle about 1500-2000 and when driving for a four cylinder is way to high. Fuel consumption has increased as well. I've replaced the IAT sensor and looked for any vacuum leaks and could find none. My temperature gauge is now faulty and is all the way to the bottom of my dash. I'm debating on switching back to stock air system but not sure if that will fix the problem. There is no engine light on and has a very rough idle. Almost sounding like its about to stall. Please help!