Give us a clue on which car you're talking about.

Sorry, its a 300SEL, I have wide open access to the plugs and can get a good grip on the boot, I tried twisting it back and forth and jiggling while I was pulling on it.

Also I sprayed some penetrating lube down there as well.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6