What would cause a crank over but no start after tune up....

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We tuned up changing spark plugs, wires, cap and rotor. 2days later it lost power while driving. Cranks but don't start. Changed distributor, crankshaft sensor, ignition control module, coil AND computer....fuel pressure was good, but it's like computer isn't communicating with rest of ignition system...have spent over $800 and cars been down for 3 weeks.....help....