Check engine flashing is probably due to the misfire. You need to get a code scanner and see what codes come up. Then go from there. Miss could be from a lot of things and unplugging the sensors will not help you. The misfires could be bad plugs, wires, distributor cap/rotor, bad spider injector unit, bad fuel pressure regulator, bad cam shaft, low compression, EGR could be stuck open, IAC could be plugged, ignition module could be faulty or it could be bad fuel or low fuel pressure. Could also be a plugged converter or exhaust. Or simply corroded connections from setting.
As for the fuel issue, the roll over valve on the tank likes to stick and the EVAP vent solenoids can get plugged with bug nests and block the fuel from entering. The gauge issue is probably a bad sensor or bad connection common on those.
Taking it to a shop and having them run some diagnostic tests would be a lot cheaper and faster than guessing and throwing a lot of expensive parts at it. Or if you can get a code reader or better yet a good scan tool and post some codes and do some tests we might be able to help you fix it yourself.
As for your other vehicles. Post about those in separate questions (one per vehicle please) and maybe we can give you some help with those.
Thursday, April 6th, 2017 AT 5:50 AM