So I have been rebuilding my car, I have alot of parts for the engine but I haven't put them on yet. My car had been sitting for a while, but I started driving it again about 3 days ago, it started with a little throttle and a few tries at turning the key, I was driving it and noticed my speedo gauge starting jumping around, not any other gauges, just the speedo. I hadn't replaced the alternator in over a year, so I replaced it and that fixed the speedo jumping, but while driving down the road my car died, I tried popping the clutch to get it to start while going down the road and it wouldn't start back up? I could turn the key and it sometimes would start. I got home and worked on it and I could get it to start, but as soon as I would give it any gas at all it would immediately turn off. After it would die, it wouldn't start back up for like 5 minutes. I am starting to think it isn't electrical. Any ideas?