When i let off the gas in my car..it bucks really bad. My friends said that its because i have crappy old spark plugs. I havent changed them in over 30k miles. I think it time to change them lol. Does anyone know the gap for them?

 

mine came stock gapped around .038"

 

The stock gap is .040 I'm pretty sure. Your gap should be somewhere between .035 and .040. You can go down to .030 but you generally want the biggest gap that the car runs well at. Play around with a few different gaps in that range, at least 3 different ones, prefferably more, see what the car likes best.