im having the EXACT same problem with my 94 vigor... to make it even more wierd it only happens when im at 1/2 a tank of gas or less.... i thought at first i was just an idiot and maybe i was running outve gas and didnt realize bcuz the needle is a little off....but i checked and it def only happens after the half way mark.... The less gas in the tank the more it happens up until 1/4 then it happens EVERY time i stop... its wierd the car has 60,000 miles and purs like a kittten so i dont understand it ,,, i figured maybe it might be a similar issue... does it happen when you fill up all the way.... one mechanic told me it could be electrical but he only guessed never put it up and checked it out