Well, 'Malibu' might be used to set a specific location or a certain atmosphere. It could imply a laid - back, beach - side, and perhaps a bit of a glamorous or decadent setting which might contrast or complement the edginess often associated with 'Pulp Fiction'.
Malibu Sun magazine is not part of Malibu Comics. They are separate entities with no shared ownership or common themes. One is about publishing comics, and the other is likely a general-interest magazine.
Yes, there might be. Since many movies use cars as part of their setting, and the Chevrolet Malibu was a popular car at the time 'Pulp Fiction' was made or set. So it's quite possible that it appears in the movie, either as a main vehicle for a character or just as part of the background scenery.
I don't recall seeing a Chevy Malibu in 'Pulp Fiction'. I've watched the movie several times and can't remember that particular car model being in it. But it's possible I missed it, or it could be a very minor detail if it was there.
A memorable trailer funny story is when a trailer for a horror movie was accidentally edited to look like a comedy. The scary scenes were cut in such a strange way that the monster's growls sounded like it was singing a silly song. Viewers who were expecting horror ended up laughing hysterically.