rough idle with A/C

[uf_explore]

my check engine light is on, and when i stop at a red light, my rpm's drop from 1000 to 100 when the AC kicks on...when i turn the AC off, all is well...what causes this and how can it be fixed...as a broke college student, i hope to find an answer so as not to get ripped off by shady mechanics, thanks

 

[Longjohn119]

You need to find the error code the light represents ... without out it you're just shooting blanks ... many auto supply stores will check it for free ...

I doubt it is AC related, just the load created by the AC running makes the real problem stick out