Ever just want to walk away from the old car thing?

Like many, my gut says you would regret selling. I fall into the "take a break" recommendation group, but would also add that, if possible, you store it elsewhere. Keeping it out of sight makes it more exciting when you go to see it. Seeing it in the garage every day can act as a reminder and a poke in the side that you just have it sitting there and you that you should probably do something with it. Store it off site - and at some point, something will spark the fire again - and if it doesn't, well, the car will have certainly not gone down in value and then you can sell it.