Developed a miss at idle
 

I have a 91 Fc, I was on the highway, heard some detonation, and pulled over, now the thing does not want to idle at all. I thought I blew an apex. But when I get under way, over 2500 RPM, it runs strong as always. I noticed a little coolant between the inake and the rotor housings on top of the motor. I am having it compression checked tomorrow to see if there is blow-by into the coolant jacket or if that leak is a totally different problem. The car runs cool and even a little rich, does coolant cause detonation? Its a fresh motor that was just recently completed with all the best stuff internally. Any help would be appreciated

I got it compression checked. The front rotor was great, but th rear rotor has one good pulse and 2 low ones. does that mean the apex seal shatered or just wore extremely fast. It was running great not a single problem, then I got on it and it started acting funny. I pulled over and it wouldnt idle. How could it still be so fast with a blown apex seal. This didn't happen slowly, It did it all at once. It might have felt a little weak, but there was no sudden jerk or loss of power when it happened.

damaged apex seal, perhaps, but definitely not shattered. there would be no compression in 2 chambers.

was the timing set right?