Finishing touches on my 69 k5's newer engine. When I start it, it stumbles a bit then if I pump gas, it will "pass" the difficult stumbling stage and idle perfectly and does not stumble if i press the pedal fast or slow. What is the cause of this? Choke(electric)? Coil? The vacuum is perfect according to the gauge. Hmmm...any ideas? /forums/images/graemlins/thinking.gif Oh yeah, its got an electric fuel pump also.