Confused

[happysupraowner:)]

So like I posted before my car is ragging at the moment. Its smoking like crazy out the back, no smell to the smoke at all. I have no coolant overflow and my temp gauge does'nt go past halfway. What I want to know is if bad gas could possible cause the symptoms I'm having with my car? I bought gas at some out of the way mom and pop place and I think the gas had been there for years lol. I just don't know where to go with this thing. The compression test were fine on it. I just don't know what is causing it to smoke. It feels like it has lost a bit of power but other than that its fine. Thanks for any replies