So my 05 F150 had the egr valve replaced almost 2 weeks ago. Well the other day it started idling rough and the check engine light came on. What could it be? Fouled plug or c.o.p. Is bad? Or maybe a clogged catalytic converter or clogged fuel filter?

 

Could even be a vacuum leak. But then .....

Get the DTC (Diagnotic Trouble Code) and use that to begin the diagnostic process.

HINT/TIP: You'll find posting in thesection more helpful/appropriate than General F150 Discussion posts.

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Thanks. I am on a smartphone and have low signal. So it takes forever to get to all the forums. I reset check engine light by unhooking the battery for a little bit. It hasn't came back on but still has a miss