This just started the other day, but after I would start the car and get in the main stretch of highway and get up to speed, the transmission seems like it would shift and the power would be there, just hanging, and then something like the second solenoid would kick in seconds later and the car would move forward. I had a free oil change so I took it to the local chevy dealership who I bought the car from and told them to run through it. They put the scanner on it and said it wasn't throwing any error codes or anything, but the mechanic drove it could feel what I was talking about and suggested new plugs and wires. Was he right or is there something wrong with the transmission? It's noticeable in first, and a little bit in second. But once I get up to speed I can't feel it.