1987 Nissan Other

Computer problem
1987 Other Nissan Models 4 cyl Two Wheel Drive Automatic 158001 miles

I have a 1987 nissan stanza that just got a new rack & pinion and a new bat. When I stat it and drive it around, runs good. Untill I drive for more than 30 min, then it stalls? No puttering or black smoke, nothing it just cuts off. It still has power, but it wont kick over. I have to wait 30min then it starts. This guy said it might be the computer under my seat? I dont want to spend money on a hunch. Where should I start?
September 17, 2008.

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