[s-cars] ur-S4 high load misfire

[cody at 5000tq.com]

Ok I've just finished up a MRC RS2 software/injector + GT2871 setup on  
my boss/friends '93. Had some issues with the kit, some big some  
small, but now I'm down to one final issue.

We have a high boost miss. Car runs perfect in all other situations.  
Plugs look good, has the F5PDOR plugs in it. All plugs look the same,  
ie I can't pin it to a cylinder based on the plugs. It definately  
feels like only 1 cylinder is dropping, sometimes it's just an  
intermittent thing, sometimes it will completely drop a cylinder until  
you lift off. I just changed the coil boots as one showed high  
resistance, no change at all. Didn't seem to have this issue before,  
but of course the problem only seems to occur at boost levels higher  
then stock anyways.

Any suggestions as to pinning this down? There is another ur-S4 in  
town that I'd like to borrow the coil set off of, but unfortunately it  
wasn't availible today. Wylie, maybe we can work something out for  
Monday? If it works better I'd drop by and swap them one evening then  
bring yours back the following evening.

I thought about buying one coil ($120!!) and trying it on different  
cylinders, but that would be a PITA with them needing to be hard wired  
in.

-Cody Forbes
http://www.5000tq.com