[Sphinx]

alright here is the deal. I got this here 94 z28, with 107k miles on it. Has some work done to it, not really in the mood to list anything, but long story short, i started noticing a slight hesitation kinda feeling when i was maintaining 50mph - 60mph. Kinda felt like a miss. so i kept driving, few days later it got worse. Got really noticable, started affecting my starting, and so forth. So i got the idea the fuel filter is shot, so i change it, and the old filter had so much **** in it, it was just disgusting to see. Changed the gas a really dark brown and some sediment was in it. So now i was pissed, either i bought a bad tank of gas, or my fuel pump decided to suck from the bottom of the tank? I honestly have no idea, i never buy anything less then Super.. 91+ octane. So i figured it was bad gas, had about 1/4 to 1/2 a tank of gas left so i went and put $10 of super in it, so see how it helps. Now the car feels like it has 4 cyl and the are working to move the other 8 and the car doesn't want to do anything. I can crawl around, but it tries to die in idle, studders when i try to give it any gas, and just sux at this point. I am really hoping it is not an opti-spark problem, and everything else is breaking around my house, hence - no hot water at the moment, so now funds are available for my problem. But any advice would be awesome. Thanks