First of all, bump your timing to 14*.
Secondly I think I know what your problem is, if you have the equal length headers, you prolly burnt a wire....happened to me all the time when I had those pieces of shiznit. If that soesn't work, make sure your firing order is right, check to see if you are still at TDC, check to see if maybe you might of cracked a plug reinstalling them, then check your wires to see if there are any burn marks....the smallest scorch will cause a nasty miss.
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Dustin
89 Saleen GT Sport,347, TFS Street Heat Intake(port matched),TFS TW Heads(Stage 2),TFS #2 cam,BD-11A 9 psi,Crane 1.6 rr's,BBK 70mm TB,Pro-M 80mm MAF,MSD 6BTM, FMS 9mm wires,BBK longtubes,BBK Short H-pipe,American Thunder cat back,3.55's
516 rwhp
553 rwtq
http://www.mustangworks.com/rides/pictures/Listing1549-slot1.jpg
12.3@119 street tires OLD MOTOR
11.496@121.08slicks OLD MOTOR
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