I don't know but my car has started doing that too. In the mornings and after it has cooled down you can nail it and it revs through first gear, shifts and you start in second or you just start in second.
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1990 Dodge Dynasty with 275,000 miles. Mods:chiped paint, CD player. Sucks but it was free. Praying for a stang.
The "Guetto Glider"
If it ain't broke, you ain't tryin hard enough