Hi Jimmy,
Engine performance, run through the tappets if they are to rattlely then the engine cant breath. If the valves arent opening enough then it wont fuel or exhaust properly hence lacks power/ wont rev under load.
Steering if you cant see anything obvious yourself then take it to your local MOT tester explain your problem bung him a fiver and ask him to have a look. nudge, nudge, wink, wink.
Fuel filling slow yes internal part of cap down filler neck is a good poss but all you can do is check all the pipes are clear. but the breather will have a one way valve on it as from a certain date ( tech details escape me as im getting old and cant remember it....LOL ) they had to have this fitted incase vehicle roll over to stop leaking fuel incase of fire!
HTH's
Shiny.
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