The engines have plastic "bridge" tubes that move oil from one set of valve actuators to the other. They are heat-sealed on one side and the seal blows out, with the result that one hydraulic actuator doesn't get oil. A very common 119 problem. Sounds like you have this issue along with a couple of bad coil packs.

You can get an OBD reader for almost nothing to tell you which cylinders are misfiring. It is probably the coil packs or the shop screwed up the wiring when they removed them for the compression check.

The replacement bridges are about $12 each, and you need 16, along with the plastic chain guides. I did a post in the Tech section awhile ago about how to replace them. It's a lot of wrenching, but not very complicated.

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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