I have a 93 jeep cherokee 4 liter, 6 cylinder. The problem is when I fill the tank past 3/4 full or let it dip below 1/4 and the weather is above 70 degrees it wants to stall out on me upon acceleration. Ive taken it to numerous mechanics who test the pump and lines and can find no problems. Does any one know anything regarding this or another viable option to try??