1993 Dodge Ram misfire

When im driving after the engine warms up, I have a fairly inconsistant misifire.
ive changed the plugs wires dist cap rotor ignition coil and the mis continues.
do you think this is a fuel issue? There is no loss of power and this only seems to happen when im cruising whether at 70 or 25.
i also cant seem to locate the egr valve, I think it has been removed previous to my ownership.
ive traced the vacuum lines, and they seem to be correct.

i dont know what it could be at this point.
thanks guys lemme know