88 300 TE, ran fine, suddenly won't start during a shopping expedition. Jumped 30-87 on relay, pumps run but car won't start. Jumped 30 to 87V to activate cold start injector and it did start up. Replaced fuel filter, started for a minute but wouldn't idle and finally stalled. Replaced both fuel pumps, car still won't start, although the pumps run. Lots of fuel in tank and it flows from tank into first pump o.k. Fuel filter was dirty.
What could be causing this problem?

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