The air filter housing is kind of a bugger to get on straight. (at least mine is...) Verify that it's fitting correctly. It's probably nothing to do with your problem but good to check anyway.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250