you must remember meakinelli, that yours is not ancient, but is an old truck, so things like wiring gremlins will possibly be there.
time and patience can fix anything - with a little knowledge on what your doing helps (are you mechanically minded, or electrically minded?)
when yours plays up, is it sticking, or going erratically all over the place?
I am guessing that Locks got his fixed, as there is no new replies from him about this