dustyr

Got ready to leave on a road trip yesterday. The car has been running perfectly . I got ready to leave and the car would not start. It tries to run on 1 or 2 cylinders but dies out. I have pressure at the fuel rails, fuel pumps are running during start up cycle. There is about 3/4 tank of fuel in tank. Plugs are fresh. One thing I did between stopping and starting the car is I added about a pint of fuel injection cleaner to the tank. Ive used this brand for years with no problems. Checking relays. What are relays "G" and "H" in the trunk, filler cap polarity reverser. Any help would be appreciated. thanks Dusty