Engine spasms to a stop after turning the car off?!

[Guest livedrive]

Hey guys, I have a weird problem that just cropped up in the last week. When I put my car into park after running for a while and then turn the key off the engine spasms to a stop. It's like it's still getting spark after the car is off, and so it just chokes from lack of fuel/air I guess. I really have no idea, but it really resembles dumping the clutch on a manual shift, which is what makes me think that...

 

What is really weird is that is I pull my car in, leave it in drive rather than park on neutral, and then turn the car off it doesn't do it. I'm at a loss. Does anyone have an ideas as to what could be causing this?

 

Thanks.

[COZY Z COLE]

On this page read pre-ignition and the causes...

 

http://www.misterfixit.com/deton.htm

 

BTW, don't double post, you posted the same question in the Chevy forum!!

 

LARRY

[Guest livedrive]

Hey, sorry about that. I wasn't sure which forum was the best one to post it in... Thanks for the link though!