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Depending on your Grand Marquis's mileage...it sounds like plug wires and plugs...(worn out) and or engine timing/firing order? If plug wires recently changed...the spark plug wires are in the wrong firing order...confirm the firing order from your local parts store by phone...and retrace each one...always start with #1 cylinder...hope this helps.
You will find the spark plug gap and timing specifications listed on the vehicles emission label under the hood, and those specifications are the ones to be used on that vehicle and engine for that year, and no other specifications should ever take precedence over the specifications listed on the vehicles emission control label. Here is the firing order diagram for that engine, let me know if you require any further assistance, and I an curious as to how you got taken for $2,000.
The correct gap is 0.054 Don't for get to buy the anti seize for the plug so it's easier to replace the next time your replace them and if you use Platinum Spark Plugs, your good for 100.000 miles before they need to be changed if your engine is running 100% on emissions. Good luck and hope this helps.
The last cyl. on the driver's side is #8 clostest to firewall #1 is on the pass. side front then 2,3,4
drivers side 5'6'7'8 most common fault is the coil on plug. check the spark plug for fouling and change if needed
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