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Check engine compression and compare. then test running engine compression most engines have about 130-170 cranking compression and about 90-110 running compression. OR bring that cylinder to its Top Dead Center compression stroke apply air to the cylinder and check to see where the air is going open throttle plate bad intake valve, from exhaust pipe bad exhaust valve, from oil cap piston rings.
I'm assuming this is a 5.7 hemi. Remove the 8 coil packs that are bolted to the top of the valve cover. You can do 1 at a time. Each coil pack has two spark plugs under it . use a 5/8 spark plug socket and extention. If its a 4.7 the coil packs are held on by one 10mm nut. These packs are just inside the valve cover on both sides of the engine. There will be only one 5/8 plug for each pack
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