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We have a 1989 f150 4x4 6cyl 4sp. I was coming down interstate last nite and engine lite came on and oil pressure guage drop to zero,(engine was pecking like a lifter not knocking) pulled over and at idol guage came back up and lite went off, pull out got back up to 55 and lite came back on guage dropped, pulled over checked oil and it was full,lite off and guage up.Any ideas what might be going on.