My 89 gt is getting no spark, checked coil, distributor and cps and cis, distr. wires, replaced ign. module, replaced computer..... what should i try....this problem has stumped 3 different mechanics including the local ford/mazda dealership( most likely they didnt want to waste their time on a car this old), one guy replaced the distributor with a used one, but has the numbers... F220... written on the side. But my computer and ignition module has the code...F230... on them. Is this the right distrib.? Is there a company that can check the computer for cheap?