Yesterday the rig (86' 135K miles) started having a little shimmy during normal acceleration, if i accelerate hard or coast i dont feel it. Fluids are ok, I do burn oil a bit so I am wondering if i have lost a spark plug if it would feel like this? I will check those when I get off work today... Any thoughts of other things to check would be helpful, thanks P.S. how bad is it to over fill your transmission fluid? if you are a qtr inch higher than the FULL WHEN HOT on your dipstick when you are cold. How bad is that? ( I will drain it but I'm just wondering) THANKS FELLOW K5ers!!!