PO456 is most times a gas cap or gasket,
to get an incorrect gear ratio the transmission has probably started to slip.
Change the fluid and filter first off in the transmission and use only atf+4 fluid and possibly the govenor pressure sensor,and change gas cap.
Less than 5,000 miles ago the Transmission Fluid was flushed
Less than 5,000 miles ago the Transmission Fluid was flushed
Less than 5,000 miles ago the Transmission Fluid was flushed
Less than 5,000 miles ago the Transmission Fluid was flushed
Less than 5,000 miles ago the Transmission Fluid was flushed
Less than 5,000 miles ago the Transmission Fluid was flushed
Less than 5,000 miles ago the Transmission Fluid was flushed
sorry about the triple post... internet was acting up.
Less than 5,000 miles ago the Transmission Fluid was flushed
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