The EZL is the box that controls the spark. It's mounted down in the driver's side fender area sort of behind the headlight. They use the same Bosch 1012 ignition driver that plagues the vintage Porsche and BMW crowd with spark issues.

It's possible you may be flooding. Try unplugging the idle solenoid and giving it a few whacks with the handle of a screwdriver. If it's stuck shut or if the idle control module has failed and is commanding it fully shut, you could have a potential "no air" situation.

You've poured fuel down the intake manifold and gotten nothing. It isn't a fuel problem.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]