thanks for the tip about the fuel rail. i am going to change the fuel filter this saturday. from what I have found, it only has one filter, it's inline back by the sending unit?!?!
i looked up bp products, it seems their fuel system cleaner is "44k". is this what you are referring to?
the knocking accompanied the rough idle, so somehow they are twisted together.
your tips about the fuel system have me wondering if the fuel filter is partially plugged/injectors are filthy and the car just isn't getting enough gas. guess i'll know more this weekend.
again, thank you.