olds 350 with edelbrock performer rpm package, holley electric fuel pump. driving car around yesterday for awhile then all off a sudden it starts to hesitate on take off and act like it wanted to die out, then it would go back to normal, so i kept driving and after sitting at the light as i go to take off it hesitates and then it dies out, i let it sit a few seconds tried to crank back up no luck, 2nd time it cranks back up and as i accelerate it hesitates again then it goes back to normal and it ran fine after that. any suggestions new motor 1800 miles