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Got a PO353 and a PO356 what does this mean

(1999 Ford Expedition)
in El Paso, TX on March 29, 2013
Changed Coils all 8 and spark plugs
Didnt have this problem before
Also getting a misfire
Displaying 2 answers & 3 comments
Popular Answer
on March 30, 2013
Check wire connections at coils # 3 & 6 possible damaged, loose connector. Check for cracked spark plug insulator, same cylinders 3 & 6.
# 3 is 3rd cyl from front on pass. side, # 6 is 2nd cyl from front on drivers side.
on March 30, 2013

Thanks it was one of the spark plugs and one of the connectors # 3
Thanks again!!
on March 30, 2013
Cool, U welcom.
We try!
on March 29, 2013
should get compression check. possible may be loose spark plug or fouled threading. these engines have a shorter thread count which has caused several issues varying from vehicle(spitting plugs, spark plugs snapping during extraction, thread slots that are brittle and prone to cracking, etc).
on March 30, 2013
Thanks it was one of the spark plugs and one of the connectors
Thanks again!!
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