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03 mercury grand marquis gs has stumbling and stalling. All this after washing the engine in a car wash. What's possible things wrong

Vehicle: 03 Mercury grand marquis gs 4.6l

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Hi there,

Washing the engine could cause an issue with the spark plug wires or ignition coils. Here is some info for you regarding these codes. 

P0305 MERCURY - Cylinder 5 Misfire Detected

Read more: https://www.autocodes.com/p0305_mercury.html

P0316 MERCURY - Misfire Detected On Startup First 1000 Revolutions

Read more: https://www.autocodes.com/p0316_mercury.html

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