help before i shoot it, please!!!

[68C15]

#4 is directly 180* off of #1 and has a high tendancy to miss if the dist. is not adjusted correctly. the cam retard should be 0* +/- 2* @1000 RPM as shown on the scan tool.

did the intake gasket slide down on #4 causing a vacuum leak? try spraying carb cleaner across the intake-head surface while watching the short term fuel trims.

is the dist. cap allowing a crossfire inside the casting? aftermarket caps are mostly junk at best.

have you ohm'd the injectors and tested pressure drop?
last but not least, did you do a compression test? <valve guide or broken/weak spring>