So, I've had an '07 Aveo5 for about 6ish months and I have liked it so far other then the fact the gas mileage and HP are not what I expected(I honestly think there's a problem). When the engine is just idling, it rattles a bit I guess you could say. It's also a little sluggish in 4th/5th gear, putting the pedal to the floor does nothing. The previous owner had customized it a bit and I'm worried he busted the timing belt on it and it might of scared a piston or something. I might go and record the sound and post it up so it can explain it better then I can lol...
It gets about 28-30mpg tops. Has an aftermarket K&N filter on it. Also the tires and rims are not stock, they are P195 R15 65? The last number i'm not sure about. Any suggestions would be appreciated!