I have a 1995 Civic LX which has developed an acceleration problem very recently. From a dead stop when I accelerate heavily (say to merge into traffic), the car seems to shudder and then finally pick up speed. I should note the transition from "shuddering" to normal acceleration happens very quickly, as if a switch was being thrown. I was thinking fuel filter, but it would seem that acceleration would be poor at all times if that were the case. If it is fuel filter, how easy is it to change? As I recall, one is near the engine and the other inside the fuel tank (?)