hey, i have a 1986 4runner and seem to be havign a very annoying "bucking" problem... it seems to happen after about 5 - 10 mins of driving but the odd thing is when i shut it off, it runs fine again for another 5 mins or so... i have had it looked at about 3 times and the dist. cap, rotars, and plugs were all changed but the problem is still there... could it be a fuel pressure pump or filter? maybe electrical..anything would be greatly appreciated!