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I have just put a flow master muffler on my 99 ...

Sent to Car Experts March 06 01:19 AM

I have just put a flow master muffler on my 99 Expedition. Then it started jerking back around 60 to 65 mph. Then I changed the spark plugs and wires, now it is starting to skip bad. What could be wrong with it now?

Optional Information:
1999 Ford Expedition 4.6L

Already Tried:
Changing spark plugs wires.

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Info Request
March 6 7:01 AM (5 hours and 42 minutes and 17 seconds later)
         
Is the check engine light coming on?

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