linkage

i recently purchased an 86 gxl w 36,000 miles on it ... it idles really rough and has no power.. i pretty much have to be going down hill to get above 5000 rpm it sat for the better part of a year i belive.... it has new battery plugs wires .... i noticed when i replaced the plugs and wires that the l1 and t1 plugs were fouled and the L1 coil port had a lot of build up .. I'm guessing i have to replace the coil but was wondering if anybody had any advice before i spent the dough thanks...... Link