everytime i first start up my car or when it idles, it idles really low like around 500-600 rpm, it will make a ta ta ta ta ta sound and just sound horible, im not shure what it is, this all started when i put my ac on my b18c, i was told to use a single cam d16 ac belt for the compressor, but i think the tension might be too tight because when ever i turn on the ac it will sqweel.