I have a 1999 F-150 with a 4.6 L Triton engine which misses under highway load.Dealer diagnostics prteseneted codes P301, P302, & P303.Right valve cover reportedly leaked causing plug wires rto short.All plugs and plug wires were replaced and tuneup performed.Engine continues to miss under highway speed load.It feels like a centrifugal advance failure of old.Recommendations please!
Year : 1999Make : FordModel: F-150Engine: 4.6 liter Triton
Engine missing under highway speed load.
93,000 + miles on vehicle.
Dealer diagnostics reported codes P301, P302, & P303 and found right bank valve cover leaking and shorted out plug wires. Dealer replaced all plugs and plug wires, and performed tune-up.
Vehicle still exhibiting severe missing under loading.
Sounds like vacuum advance problems of old.
Please provide recommendations!
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