jbrhino

the transmission keeps trying to grab 5th and then back to 4th, then tries upshifting to 5th again. It does this over and over rapidly, until I lift of the gas and it will finally grab 5th. I was able to simulate the problem shift manually in Tip mode as well as in regular drive. Any idea in the possible problem, the problem will not occur on the 3rd to 4th, or 2nd to 3rd shift only 4th to 5th.
Any gues to what the problem might be?
ps. The car has APR 1.0 bar chip and TAP Exhaust with K&N.