help my car has a 2.8 with mpi it started to run real ruf when started but when warm it cleard up then it started running real rich and now it has just died it will turn over but no go i was told it could be the main computer it codes back when jumperd as 12 which is fine but it is not im going crazy with this car please help....

Try the warmup sensor.If faulty or disconnected the car will behave as you describe

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