Every time I start my mustang when it's cold it idles really rough and dies then the 2nd time it fires runs a little rough and then is fine after a little bit. It did it every once and a while before my chip but now does it all the time with the chip. anybody know what the problem could be?
It is probably the IAC. Pull it and clean it out with some intake cleaner. It can't hurt. The chip may be trying to run your idle a little lower hence the reason why your are noticing the problem more now.
Yes the plugs are the stock ones that came on the car. Should I put in something different. What would you recommend?? I'll try cleaning the IAC. Thanks for the help!!