Have been having very rough idle problems for the last couple of months , and Finally have time to try to figure it out. On cold start, car idles fine . Once warmed up , car starts vibrating crazy at 6500 RPM. Idle seems to go up and down as well . Rough idle is most noticeable at a red stop light , and even crazier when going reverse .

Started by cleaning the TB, was a little dirty, but nothing over the top. I also included a vid , checked the engine mounts, seemed fine . Car's idle is so rough you can feel it by touching any exterior part .

Car sounds like it also has a vacuum leak, so currently taking off both plenums and hoses and retightening everything
Any clue?
http://www.flickr.com/photos/61136499@N06/8551800961/http://www.flickr.com/photos/61136499@N06/8551800961/ by http://www.flickr.com/people/61136499@N06/, on Flickr


http://www.flickr.com/photos/61136499@N06/8552902324/http://www.flickr.com/photos/61136499@N06/8552902324/ by http://www.flickr.com/people/61136499@N06/, on Flickr

http://www.flickr.com/photos/61136499@N06/8551800321/http://www.flickr.com/photos/61136499@N06/8551800321/ by http://www.flickr.com/people/61136499@N06/, on Flickr

http://www.flickr.com/photos/61136499@N06/8552901532/http://www.flickr.com/photos/61136499@N06/8552901532/ by http://www.flickr.com/people/61136499@N06/, on Flickr

http://www.flickr.com/photos/61136499@N06/8552900578/http://www.flickr.com/photos/61136499@N06/8552900578/ by http://www.flickr.com/people/61136499@N06/, on Flickr

 

for some reason my computer wont let me see the vid. did you check your air filter? sometimes if its real clogged up it can cause a rough idle. maybe check the sparks too?

 

but dont take my word on that, thats just my $.02 haha i would probably wait for a more qualified answer than mine

 

Put everything together only to hear this

Wtf

 

Omg that scared the **** out of me.. lol

 

wow i have no clue

 

my good friend works at Stillen in the import dept. his name is kenny, im sure if you call stillen and ask for him he will be able to direct you better. he is a genius when it comes to imports and engine issues. his ext is 185

 

the heck.. never seen something like this before. Sounds like timing or vacuum leak

 

Post this on my350

 

Took everything off and put everything back on.


Same ****

 

Are all cylinders firing it sounds like its only running on three cylinders.

 

How would I be able to tell?

 

damn that is not good, my advice contact greengoblin aka Danny i am sure he can pin point the problem.

 

Have you plugged it into a scanner and see if it's throwing any codes? Vacuum leak on that second video possibly?

 

When you cleaned the throttle body, did you push the butterfly with your finger to clean it? If you did then start with calibrating your throttle position sensor. Remember the gas pedal is all electronic you can't clean it like the regular ones., Then do a vacuum test to see if there's a vacuum leak, but sounds like random misfire.