ethanol, gives a slightly higher hp rating, but it wont really be noticed with a 10% concentration. it does lower mpg. but its cleaner for the environment because it doesnt deposit as many pollutants as regular fossil fuels. however if it was 85% ethonol you would see a 10 % hp increase, but a 10% mpg loss. ethanol is a renewable resource so, i wouldnt be surprized if we saw cars running off of this in the near future.
i could go into more but, that is the jist of it.
o i forgot as to what kinda effects it has on drivability, or how the engine runs i dont know. but to mee it sounds like you many need a new fuel filter, plugs, wires, coil. try the fuel filter first since its only like 5-10 bucks.
Experience is the worst teacher; it gives the test before presenting the lesson.
Why do you need the cats when u have dogs

04 WRX - TOTALED 3-5-05
Previoius Owned: 96 Contour LX with svt kit