Does vaccuum leak throws misfire codes?/

 

They can, but so can many other things.

Jeff

 

jeff?
Would that cause misfiring??

 

I was getting a random misfire code being set about once a week a few months ago. Never consistent with any one cylinder IIRC. I replaced all the vacuum hoses and the code has never come back. I bought 4ft of hose and probably should have bought 5. 4 was exactly enough. Took maybe 30min-1hr to change them all. Pretty easy on the 2.8l.

Maybe you have a bad intake manifold gasket. Change all the vacuum hoses first, it is really cheap, maybe 10.00 dollars at a parts store for the vacuum lines.

Jeff

 

What exact code # are you getting on your car?

 

here is the codes
P0300 random multiple cylinder misfire
P0304 cylinder 4 misfire
P0306 cylinder 6 misfire
p0305 cylinder 5 misfire

spark plugs, wires and coil already replaced.
no misfiring when it is idling but if I go up to 5000 rpm
range it throws these codes.
I ordered new vacuum hoses, should be in thursday

ANY SUGGESTIONS WHAT TO DO?
Thanks guys