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My car is running sporadically.

(1990 Cadillac DeVille)
in Junction, TX on March 12, 2014
One day it will be running fine and the next it will be surging, have a rough idle, and will die. We have replaced the rotor, cap, module, spark plug wires, coil, spark plugs, fuel filter, fuel pump, and oxygen sensor. I cannot get the computer to read. Somebody has suggested that it may be the computer or the timing chain.

-Any help will be greatly appreciated.
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Popular Answer
of G. T. Service Center on March 12, 2014
You read the computer through the a/c heater control head, and it's been awhile for me to remember exactly how. If I was looking at it I could remember.
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