Hi. You will need to Adjust each spark plug gap to 0.031-0.035 in. (0.8-0.9mm). With that said; i would check the status of all the ignition coils that are on top of each plug. Your engine is equipped with a COP coil design. Each plug will have its own individual coil on top. Each coil can be tested for proper resistance levels. You may have one or several bad coils that are malfunctioning. If these coils have not been changed, I would recommend to test each one to be sure that they are functioning at a high level.
Here is a simple testing procedure to verify that your coils are functioning as designed. A weak coil will cause a very hard start situation. Follow carefully:
1.First you will need to check the ignition coil assembly for insulation. Check terminals for corrosion or damage, and replace as necessary.
2. Next; Gather you ohmmeter or multimeter and measure the resistance of ignition coil assemblies and compare with the following specifications:
a. Terminal 1 to 2: Without 0 ohms or infinity maximum ohms.
b. Terminal 1 to 3: Without 0 ohms or infinity maximum ohms.
c. Terminal 2 to 3: Without 0 ohms or infinity maximum ohms.
3. Now; If the measured values exceed the specifications listed above, the ignition coil must be replaced.
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