The 3.4L has a timing belt and a timing chain. britta6867, check your timing belt. remove the cam covers on the passenger side of the engine( 8mm socket). Check for what seems to be hairs inside of the cover (belt fraying). If no hairs or just a few are present, you need to remove the lower timing cover and check to see if your timing has jumped. Align the timimg mark on the intermediate shaft gear with the notch just below it. The marks on both banks of cams should face each other; if they do not, your timing has jumped; it will cause your car not to start. If it has jumped you should replace both timing idler pulleys, along with the tensioner pulley and the actuator spring; belt too of course.
A broken timing belt on a 93 won't be so bad, unless he was @ 6000 RPM when the belt broke. 91-93 3.4L's are non-interference engines.
The 3.4L only has one dogbone, and even with it off, it does not tilt forward. If it does, your lower mounts are shot. To get at the rear plugs, remove the weatherstrip that rests above the rear bank of cylinders, that should give you enough room to maneuver a long extention with a spark plug socket. If not, you can always notch the metal just above the rear bank with a cut-off tool. (mine was done before i got the car, I change all 6 plugs in 5 min.)
Ignition modules usually don't just fail all at once, but anything is possible, so I would have mine checked. Your local parts store should have the machine to check your IM.