Re: 2009 Saturn Outlook Jerking only at 60MPH
Don't assume a misfiring condition always causes a check engine light. At 60 mph, the rpms are low and the engine load is high, which results in any misfiring causing the bucking condition.
My recommendation is to replace ALL the coils and the spark plugs. In reality, you may have one cylinder misfiring, however, since all the original coils and plugs have seen the same conditions, odds are good when you replace only one, another one will be soon to follow (failing).
'09 XR, AWD, all options except rear DVD entertainment