Engine runs rough and want to die when i put it in gear or when slowing at an intersection some times it runs perfect but not for long i changed sending unit , filter , and complete tune up. sometimes if i am driving when my foot is on the gas it just kinda shuts down and if i kinda feather pump the gas itll keep going

This condition can be caused by a sludged up idle speed control valve and a dirty throttle valve, do the following procedure to correct this, if it still doesn't repair the problem have the idle speed control system tested by the dealer.

Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

You may be having some problems with the fuel pump.
or a vacuum problem.
I would look at the vacuum lines first and see if maybe you have a leak-or an intake manifold gasket leaking vacuum.