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Did you get the tiiming belt changed recently? If so then the mechanic screwed up the install and needs to reinstall the belt.
Other things that might cause this:
-timing belt worn and stretched, has skipped a couple of teeth i.e. it has jumped time
-timing belt tensioner worn out and not applying pressure to idler, and timing belt is too loose and has jumped time because of that
-One or more injectors clogged or dead (i had this happen on another car and it also idled poorly too, but did not even throw a code)
-weak fuel pump (but usually a fuel pump just quits working and does not do a slow fade)
-one or more spark plugs not firing (but usually this would make the CEL blink on)
-one or more dead coil packs (the big plastic and rubber thing that fits over the spark plug)
-low engine compression and needs a valve job or more
-a transmission issue
Last edited by marc780; 02-19-2008 at 01:55 PM.
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