Follow up to my first post--on some advice here on the forum, I checked the crank position sensor resistence values. It shows an open. Just to be sure, I checked my 87 560 SEL and it checked 970 Ohms, what the book said it was supposed to. SOO, we ordered a crank position sensor and a distributor cap at 154.00 and change. We'll see when the parts get here, stay tuned....