I isolated it to these cylinders in two ways. (1) I disconnected each plug wire one by one at the distributor cap. There is no change in engine performance when cylinders 2,4,7 & 8 are disconnected. (2) When I changed plugs, cylinders 1,3,5 & 6 had plenty of black carbon residue (too much) on the plugs and cylinders 2,4,7 & 8 plugs were so clean they looked like they hadn't ignited fuel for a long time. Shouldn't they be wet with fuel if it's being delivered properly? -Mike

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1973 280SEL 4.5