I've been working on my dad's X1/9 which has been parked for a good 15 years or so. After a lot of miscellaneous fixes and repairs we've got the car on the road and got to take it for a little cruise. Everything went fine until about two or three miles from home when we just lost all power. I managed to keep the car idling, but anytime I pressed the accelerator it choked and almost died. Managed to get it back home by fluttering the gas and keeping it in the lower gears. The next day we tried it again and had the same problem. It runs just fine and drives great until about two or three miles, once everything warms up it loses all power and just wants to die. We have fresh gas, a clean fuel filter, new lines from the fuel pump to engine, and we're both a little stumped. Does anyone have a suggestion or idea?