My 4.0 starts fine but after it warms up it idles so rough that the exhaust rattles, also gas milage has gone way down. Engine lt. Says cyl. 3 missfire. I have changed the spark rail. Plugs, and checked injectors. Replaced fuel pump. I have not changed O2 sensors. The drive rod for the oil pump and camshaft position sensor was recently replaced by a shop, so I assume the timing is ok. I took the cat. Converter out and it is ok.
have the same problem?
Saturday, March 7th, 2009 AT 9:13 AM