05 mustang GT performance white

Laura 4.6

New Member
Jun 12, 2018
2
0
1
27
San Antonio Tx
First time on here. Need help. Have recently changed my spark plugs to e3.70 and installed SR performance coils. But now when I turn on my car it has a stutter still.
Also another thing I can turn my car on and it idles at 5-600 rpm and I turn on AC n it drops to 2-300 RPMs. Anybody tell me why.
 
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Laura 4.6

New Member
Jun 12, 2018
2
0
1
27
San Antonio Tx
I have a 2005 mustang GT
And was wondering if anyone can help me with something.
I have a issue to where I turn on my AC and my rooms drop from 5-600 to 2-300
Why?