93 2600i ext cab, automatic, gas. Pretty little thing BUT has a problem . Help us if you can. It will stumble several times when first stated in the morning the starts and runs fine as long as the gas tank is running over full. After the top gallon is gone it stops running and will not start until that top gallon is replaced. The fuel pump was replaced but not the sending unit nor the gas level sending unit were. Please forgive for the first post to be such a strange sounding one. J.J.