Want stay running

And when u r keeping it runing bye pumping gas its runing bad and miss fire's time from time

First thing to do would be check all your plug wires, make sure they're on tight, and double check the order. If you didn't replace the cap or rotor, you may want to take a look at them, too. Check for corrosion or cracks on the bottom side of the cap, and on the rotor.

check your fuel pressure. The pump in the tank is probably getting ready to die.