Crappy Idle, Terrible exhaust note under load

[RedMerc04]

Just what it says, I think i got a batch of crap gas. I filled up at my usual station with 93 octane as always. It drove fine for about 20 miles and then it started running like absolute crap. The check engine light came on so i threw a fuel system cleaner and about 20 bucks worth of new gas. The car ran much better after that but as i made my way down below a quarter of a tank it began running like crap again. I filled up and it still ran crappy until i put in Drygas and another fuel system cleaner. This brings me up to now. The car is alright for the most part but the idle can still get crappy at times and its not as ballsy as usual. Any Suggestions? Ps.. My mothers continental was filled around the same time at the same station and it too is having the same problems

[cyclopsram]

Drain out a sample from the tank and take it to the offending station and get the folks to check their tanks and then take the nice letter from your lawyer to them after you have your sample analysed...... In the meantime be sure to r and r your tank and have the contents preserved for the trial...

[usafsniper]

Keep your gas receipts and find out who inspects stations in your area and give them a call. The receipt will be your proof if anything goes down hill with your engine.

[RedMerc04]

I just drove it around the block and it seems a bit smoother. It will idle normally and then every once in a while it will start to get rough but it comes back out of it. Could it be a combo of things? Possibly Bad gas and an IAC sensor? O2 sensors? This is driving me nuts.