Hello! I own an 07 GT Convertible with an Automatic Transmission that I bought used 2 years ago with 36K miles. It now has just over 40K miles and has had a strange, intermittent problem since I've owned the car that is very annoying, and I can't seem to find anyone who can give me any advice. During aggressive driving under WOT when the trans is about to make it's 2-3 upshift, it hesitates to make the shift (like it doesn't know what to do) and will then skip 3rd gear and go directly into 4th gear. The other issue that I'm having is when just driving around normally with the OD turned on, when accelerating and going through all the upshifts, when in 4th gear it will skip 5th and go directly into OD. Is that normal? What I've been doing to help with that is to turn the OD off, and it will then make the 4-5 upshift and I can then engage the OD when I desire. My thinking is that there is an issue in the solenoids in the transmission valve body, but I'm not sure if this is something that can be corrected with a tune file (I have an SCT Tuner) or if the transmission is going to need to be repaired? Has anyone experienced anything similar, and what did you do to correct it? Thanks!