Hello, Recently my car started making a "grinding noise" every time I start it, and it seems to go away after the car starts. Just now I went to start my car and it started right up, but shut off right after it started. It did this about 5 times until I held my foot on the gas a bit to keep it running, then it ran fine.. My cars pretty stock besides a bbk CAI and sct tuner chip. Any ideas? Thanks!