2002 Ford F150 5.4 Idles Rough Please HELP Dead End?

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steveh018

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When the truck is idling there is a constant vibration and slight shake felt in the doors and seats. I can see the seat belt and side mirrors vibrate. Under the hood the engine looks and runs normal. The rpms are steady and the needle does not move. The truck has 42,000 miles. So far I have replaced all eight plugs and coils, dpfe sensor, pcv valve and took it to the dealer for the fuel system cleaner. Still has not fixed it. Since then I have taken it to two different dealers and they say everything is normal and to just drive it till the check engine light turns on. I am thinking of replacing the MAF and IAC sensor next. I know this is not normal, and am looking for any suggestions to fix this. Thanks
 
Check for possible vacuum leaks i 've had a few on my old F-150. The rubber elbows at some of the connection points on the intake seem to get brittle and crack. There's one at the back of the intake that i have known a few people to have go bad on theirs. Hope this helps, good luck!
 
check for a vacuum leak with a can of gumout or a leaking EGR valve,it's not likely to be a MAF or IAC but I have seen stranger things be true
 
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