Okay I drive a 1999 chevy tahoe and it starts but after it does it turns off. like it isn't idling high enough you have to step on the gas pedal and hold it at a 1 or a 1 1.2 then it will catch and work normal. I just wanted to know what could be wrong and how much might it cost to fix it. I want to make sure the shops around here do that a lot. Even more so when you don't know what is wrong so if some one could help me out to what it might possibly be I would appreciate it!!