First thing is to borrow a timing light, connect it to #5 wire and make sure #5 is firing. If isn't, you could have a bad wire or boot, even though they're new.
If #5 is firing, and the other plugs look OK, the problem could be the injector. If you want to test this, you can swap #5 injector with another cylinder, and see if the problem moves. You could also just replace #5 and the seal.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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