My manual Mazda 323 have been incurring erratic idling and I turned to have it tuned-up and all. The idling went better but I still manage to observe times where the idling dropped too much to have the car shake a lot.

I happen to notice that this only happens when I'm in traffic, whether night or day. I realized that the only difference between my everyday driving and when in traffic is that my condenser is not properly ventilated. I thought that since the condenser is getting hot, freon might not be circulating well making the compressor work hard and making it harder to rotate. When that happens the engine would then have a sudden additional load thus experiencing sudden idle drops :roll:

These could probably be cause by clogged condenser or unbalanced freon charge?

Are my assumptions making sense?