Rough Idle After Hard Driving

[Dr Z]

After new valve springs, that never happened again to me, even with 300+ rwkw and plenty of hard squirting.

[Guest]

After new valve springs, that never happened again to me, even with 300+ rwkw and plenty of hard squirting. 

<{POST_SNAPBACK}>

What springs did you use???

vik...have heard of changed springs failing

[LeighD]

Yep Fill, sounds like valve springs. Mine does the same. Uncle Goldie's chuckin' my valve springs in next week, hope it fixes the problem.

This may be slightly off topic but I will ask anyway.....

Can the valve springs also cause an intermittent idle problem? My car will idle fine most of the time but if I have been sitting at the lights for a while it can start idling rough and stall if the computer doesn't catch it in time.

So far my Ford dealer seems to have no clue. They have just replaced the PCM because it had some strange error codes on it that seemed to point to a problem with the computer itself. The only thing that I have done to it lately is to put some Typhoon spark plugs in it (they are colder) then gap them at 0.9mm as per CAPA's suggestion for my edit. Could this be causing the problem? I have also checked the manifold for leaks etc but can't find anything.

Has anyone experienced this before??

[Guest]

If that's the only things you changed,then that the problem

vik...that's the way I figure it

[LeighD]

If that's the only things you changed,then that the problem

vik...that's the way I figure it    

I would normally have agreed but it just seems a little strange to me that it idles fine most of the time. The stalling problem also did not show up until about two weeks after I put the plugs in.