i am having problems maintaining speed after about 20 minutes on flat roadways
What is your question?
On hills i lose speed much quicker until the car loses enough speed that it is basically idling and i have to pull it over to the side. If i shut it off for a minute or two it will have full power for about the same amount of time. I had it hooked up to a computer and i got a lean code.
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I have had it checked out. It showed to be good. I have also had a fuel pressure test. Its good! I've also replaced fuel pump assembly.