Is there a black cloud following my 87 16 valve? Still will not idle. New over-voltage relay, Fuel system pressure checks in at 86 psi. Took off the valve cover and found the top rail broken. Two pieces recovered. One the size of a thumb nail is MIA. Should I go after it? Probably in the pan. Does the oil pump have a screen?? The motor still has good compression, with all cylinders within 10%. Number three is a little sluggish on the first stroke. Planning on replacing the chain, top rail and tensioner. Can you easily get to any other rails to replace them? What else to look at for the idle problem? If you hold it at a stready 1000 rpm, it will clean itself up and surge to 1400 and then load up(?) or drop down to 800. Any advise.... Thanks