I finally got my '88 Raider running. It's got the 4G54, jet valve elim kit and 4 speed overdrive trans. I have done almost everything on the TO DO list (including a drain and fill of the A/T) except replaced the thermostat, which I plan to do next week. It idles fine and I can rev over 3000 RPM in Park and Neutral with no hesitations or other issues. But, when I try to drive it sputters and sometimes dies when shifting from 1st to 2d. Any ideas on what the problem could be and what to check or do next?