My girlfriends car is misfiring on atleast one cylinder (7). I removed all the..

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I removed all the coil packs on the cylinder seven side to clean the "ports" they go into and them themselves. the engine was covered in grime especialy around the spark plug ports so I figured once I cleaned them it would clear and the cylinder wouldnt misfire but i was wrong.. I hooked up my elm 327 using easyob2 and noticed the timing advance for cylinder#1 is 38.. does this sound right? also when she baught the car the previous owner said it had a coolant leak and that they had tried to fix it but neither I or afew other people could find any leak.. likit plugged itself up before we ended up buiying ther car.. she paid $600 for it wehich by all means it runs and she drove it back and forth to work for the past few months without any problems but recently her battery died so we baught one from a junkyard and she swears when she was on the highway the marquis started running realy rough.. before the battery died she's had a tranny slip betweemn 40 to 60 mph, as soon as it catches it runs strong with no problem.. I've read about the plastic manifold and drivers side head gasket just so you know.. I have not seen any leaking under the car at all sincer she baught the car. does anyone know where I can download the repair manual for this car? I've been all over the internet looking for the pdf but can't find anything but bad links and bs leads sending me to misc site's about everything but the 2001 grand marquis.. anyone got any ideas?