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  1. Same problem

    Replaced ECT sensor and truck still won’t run until engine warms up. Will start and run if you keep accelerator depressed to at least 1000 rpm. 97 ranger, 4.0. Any suggestions anyone?
  2. Truck starts but stalls until warmed up.

    I have 97 ranger that starts fine but will not stay running until engine is warmed up. It’s worse on cold mornings but it will warm up and run fine. It’s throwing codes P0171 and P0174 again. I had the intake manifold gaskets replaced and the IACV replaced and no codes for about a year. Any...

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