What would keep knocking my spark plugs off my 2002 pontiac sunfire?

[Lindsey Moore-britt]

Okay, so I JUST replaced my sparkplugs last Sunday, because my car had been jerking and running through gas ALOT!
My step dad said to get sparkplugs b/c mine weren't even there.
Okay, so I do that and it's fine and dandy till yesterday. When it started doing the SAME thing it was before I replaced my sparkplugs. What would or could be knocking or making them fall off???!
I mean I'll replace them as I need to but I'm just looking for some sort of insight.
I'm not exactly car savvy, I was just told by my step dad that my sparkplugs were completely gone, like not even there. So all I know is it's acting like it did before. So, I need new sparkplugs, apparently, but not after I just replaced them not even a week ago.

 

[wrenchin]

Are you sure you mean to be referring to the spark plugs?!? They don't just fall off, you have to remove them with a socket wrench. If you just replaced them, who did the work - a reputable mechanic?

 

[Jubfly]

Spark plugs 101:- Never remove spark plugs from an aluminum block when the engine is hot. Seems the person befour you didn't know this. Your spark plug threds have expanded. You'll be able to tighen them when the engine block is warm or cold but when the block reaches operating tempetuer they'll expand and blow out. The fix is you'll have to heilocoil the threds, hope this helps.

 

[Zimgxp]

If you had no sparkplugs, it wouldn't run.