Won't stay running...

[57loboy]

Went to start the GN today after it's been sitting in the garage for about a week, it ran fine when I parked it last weekend. Wanted to pull it onto ramps so I can swap the torque convertor out so that the "race" one is finally out of the car.
Was a little hard starting and ran rough for the first couple of minutes which isn't unusual as the chip is the 100% stock one (I have a new Eric Marshall chip matched to the injectors and new torque convertor), but today it died after running (at idle) for about 5 minutes and won't stay running when I try to restart it now.
If I can restart it, it'll catch, run nice & smooth at about 1500-1800 rpm then die right out. I swapped the MAF with a known good one, identical results. I also replaced the IAC, identical results. Checked all the spark plug wires, everything fine, nothing touching anywhere. If I can keep it running, it's almost as if it is running way rich and misfiring through the intake a little, then it stumbles and dies out. Would a failed stock "237" style FPR cause this?
Suggestions?

 

[Mad_Trbo]

Have you checked the plugs, are they fouled?

 

[bison]

double post

 

[bison]

What are your MAF and IAC numbers when its about to die out? Is it in closed loop? Could it be out of fuel? Tank empty or low pressure?

 

[57loboy]

Tank is full of fuel...Didn't capture the original #'s as it wouldn't run long enough. Took the plugs out and sure enough, all but #1 and #4 were fouled. Swapped in some new plugs, gapped to .035 and got it running. It is defintely running WAY rich (eye watering rich) and it is missing as if on a dead cylinder. Me thinks one or more of the injectors may be dumping tons o' fuel... Collective wisdom of the group thinks...? Thanks!

 

[83ttypecooled]

misfire

Hi, Is your car misfiring ALL the time? If so, locate the problem cylinder(s) and correct that problem. Then , if the idle trouble doesn't subside, I would that your reprogramming has a glitch in it. At idle, all loads off, you should see an IAC count of around 15-20, sometimes a little higher.

 

[57loboy]

Only doing this since I tried to start it today - I drove it last week and all was fine...Topped off the fuel tank w/93 octane and was getting ready to pull the transmission tonight.
Problem cylinder(s) are all but 1 & 4. Black & sooty on all plugs but those. #1 looked normal, #4 looked a little grey. Obviously something is causing massive amounts of fuel to be dumped in. Not setting the CEL though...