Have a '94 Audi 100S (2.8L). Has been hard to start lately, a little rough on idle, but otherwise o.k. Today, after sitting all day, it would not start at all. Will not even fire. Has plenty of gas, the fuel pump runs when ignition is first turned on. It has spark. I shot starting fluid in the intake and it tried to start, so it must not be getting gas. Appears to have fuel to the injector tree. Itried to plug in a code reader, but can't seem to locate a port. Any ideas, anyone??