my 2000 f-150 5.4 v8 has a very rough idle on 2000 Ford F-150

idle is always rough, this problem started as a result of replacing the timing chains. Can this problem be a result of improper timing between the two cams. Could this be the result of a vacum leak.Truck has approx. 220k miles

by in Bakersfield, CA on February 08, 2011
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 1 comment
ANSWER by , February 08, 2011
why did you have the chains replaced?? did one break?? I would start with a compression test first to check for valve damage. Yes. a vaccuum leak will give you a rough idle. the chains out of time will give a multitude of issues. Roy
COMMENT by , February 10, 2011
The chains did not break, they were worn and making noise, there was no valve damage. If the EGR is mounted directly behind the throttle body, I removed the vac line that attaches to a diaphragm actuator on this part, put my finger on the connector and felt no suction at all. Removing the vac line did not effect the idle.