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Well, finally some progress. Got the boot off of the #4 plug on the intake side with the help of a large set of needle-nose pliers. Removed vacuum line and electrical connector from the EGR valve for more clearance. Used a long extension w/swivel joint and sparkplug socket. Here's a tip: use a couple of wraps of electrical tape to stabilize the u-joint. This will aid in controlling the socket until it is set on the plug while still allowing flex while loosening or torquing the plug. Royal PITA but well worth it. Test drive showed a definite improvement in midrange power.
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