Hello,
Have a 99 grand prix. Drove to work this AM and ran like a gem. Parked and went out tonight and it runs about 35 ft and the tranny goes into neutral or so it seems, nothing in any gear just gone. Then if you shut off car and wait a minute and restart it does it all over again. Runs strong and perfect for 35 ft and then start over etc. It feels either electric or linkage based. But who knows. Thanks for any and all input.