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To the first poster: two separate mechanics found a problem with cyclinder #5, which speaks volumes as to your problem. If it is a wiring issue, either one: figure out which wire it is from your PCM (subscribe to Alldata's 94 Lesabre page and you can find a detailed schematic of your PCM's wires), and figure out a way to replace it yourself (actually test it first using an ohmmeter and a spare long wire--run the long wire from the wire you are testing connected to the number 5 injector to the interior of the car where it will connect to one of the terminals of your ohmmeter, while the other terminal of your ohmmeter is connected to the spot on the PCM terminal that corresponds with that wire that you are checking--if resistance = 0 then your wire is good, if resistance = infinity, the wire has an open. Also check the wire's continuity to ground.) Or two, pay the dealer to diagnose your problem and fix it yourself (if it is the PCM). Or three, replace the PCM even if yours if fine simply because the cost to do so may be less than paying a GM mechanic to tell you what is wrong.
Warning: getting a wire run between the under dash area and the engine compartment is not easy.
To the third poster: have a mechanic check your motor mounts, tire balancing, alignment, etc. After you know you have the smoothest running car possible, you will better know how much shaking is going on with the engine. As to causes, again have someone do a compression test, an injector balance test, a fuel pressure test, and have a GM dealership check your tranny and steering for possible problems.
Just some ideas, probably worth the paper they are printed on.
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