TPWW Forums - Help Identifying a Song

I vafuely some of the lyrics of the song.

The start of the song ( within the first verse) mentions something about someone picking up a sister or picking up an older sisters younger sister in a purple chevy ( it could have been pink chevy but i am positive it was purple).

The chorus of the songs going something like this:

" how low, how low, how low can you go?" its either that or " how long, how long, how long can you go" and then there are some other lyrics after that which I do not remember.

Some other lyrics in the song also go along the lines of:

" too fast, too slow how low/long can you go?"

And there is another line that I believe goes:
" too fat, too thin" and then some lyrics under that.

I know this iis very vague but hopefully someone can help me out. The music sounds like some sort of rock music not really hard rock but soft rock. Maybe a rock-pop kind of song. It seems as if there is a band with 1 lead singer singing the song, or its a band with 2 singers. It sounds like it was done in the 80s though.

Hope someone can help :)

Thanks,