Ugh! I have a 1990 plymouth grand voyager. It sat for about 5 yrs. We replaced the fuel pump and it helped a little. Now it seems to bog down when I press the gas. If I just barely hit the gas it will run but when I try to speed up it is bogging down like it isn't getting any gas. I tried to press gas firmly to "clear" it up and it dies! If I start it and let it run it will run forever. Unless I'm driving! Sometimes it starts right away but other times acts as if it jumped time, and then clears up. Help?