How about a '91 Buick Lesabre LTD, 180K miles, 3.8 eng. This car is plagued with stumbling on hiway and occasionally dies coming up to corner. normally, idles and runs perfect and smooth, and when it dies, I can go to neutral and restart on the run. Have replaced fuel pump,filter, and regulator, crank, oil press, coolant, and o2 sensors, ign mod, coil pack assy, plugs, wires, and maybe some things I don't remember. nothing changed. Today, I unplugged connector from solenoid on top of fuel cannister, and it ran fine. Anyone know about these things? What they do,how they're activated, How to check it, and symptems of its failure? No gas smell or plugged filter on bottom of cannister. Could this have been my problem for last 2 years? Could it be creating a vacuum in fuel tank?? Thanks, Huey286