93 Lt1 miss fire.
My wife just inherited a 40th anniversary. The car has sat for 10 yrs. it only has 7000 miles. I replaced the battery and fuel. The car runs but acts like it has a dead miss. I replace the plugs and checked the wires. Once in a while it will backfire like it's out of time. I've never dealt with the opti-spark system. Any help would be great. The car sat both inside and out!! Thanks.