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Q: What can I check beside leaks,spark plugs,coils and connectors on 1999 Ford Expedition

Checked with a Valve Guage Tester and read Late Ingition Timing
I have checked for leaks
Coil on plugs good
Put new spark plugs
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Did a tune up.
Started to run with a rough idle and smoking
Was not doing this before tune up
Rechecked everything to make sure
So checked with a gauge and it read LATE INGITION TIMING
Also no codes have come out
So trying to find out what has caused this
It also wants to stall
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