1989 Ford Mustang Convertible Chugging - Engine


Question: I'll be driving along, everything's fine, then I notice the oil pressure drops and the trans has trouble shifting into overdrive and it starts chugging. When I slow down to almost a rolling stop, oil pressure returns to normal. I've done a tune up, changed trans filter and fluid, replaced the vacuum module, replaced the fuel filter, checked PCV and it's not clogged, checked for vacuum leaks- none found. I'm at a loss. At times, it runs normally, then all of a sudden this problem starts; sometimes for a few miles sometimes just for a minute. It isn't a constant problem but it's getting worse. Any advice? Could it be the B-Map sensor? Thanks-

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Technican: Hi; Have you been able to pull codes out of the computer? Need them first before I can go any further. Thanks.
Owner: I'll check over the weekend- others have told me that this isn't something that would show up as it's too old to pull accurate codes. But I'll let you know what I get. Thanks- Tom
Technican: Hi; Just let me know.

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