Car is nosing over under acceleration

Well, I planned to attend my first race today with the car, but I have a problem. Friday night I was doing a little tuning with my eec tuner (changed the fan settings, global spark adder, and set the rev limiter to 6500 instead of the stock 7000). I took if out for a short ride yesterday and as soon as I pulled out onto my street the car nosed over. I thought that maybe it was just cold. I made it another few blocks and it did it again, then it was fine for a a mile or so. I parked the car and went into a store. I came back out and decided to hit the highway to see where my AF ratio is at since I pulled another lb of pressure out of it. I got on the highway and made a WOT pass in 3rd gear, I then left off and shifted it into 5th. I made it about a 1/4 mile and the car nosed over again on me, except this time it didn't go away. It was all I could do to keep it running. Black smoke was just pouring from the tail pipes and it was missing something awful. I got the car pulled over in a parking lot and popped the hood. I saw nothing wrong, I checked the coil and plug wires as well as the dizzy to see if it got loose or something. I got back in the car and it turned over 3-4 times before it started. I quickly got it moving and nursed it home. It seemed that if I barely loaded the car and shifted it at 2000rpms I could get around in it, but anything more than 1/4 throttle or 2500 rpms and it would sometimes nose over. The car feels just like a carb'd car does if you jump in and floor it while its still cold. I pulled all my plugs and replaced them today as the old ones were BLACK with carbon, I also re-downloaded my program into the eec tuner. I went for a ride to see if the problem had gone away but it didn't.

Does anyone have any ideas here? I'm thinking its spark related, but I'm not sure what would cause this. TFI? Stator? I'm at a loss.

Thanks for the replies guys. I did put a new tune in it before I took it out today, so that did not help it. This isn't the first time that I have messed with the tune since getting it back on the road, so I can not see this being the issue.

I am running an offroad X pipe, so I ave no cats.

I have checked the MAF and it is still plugged in, as well as the TFI.

I have not manipulated the MAF transfer function so that shouldn't be an issue. I've put nearly 700 miles on the new setup since getting it running and I had no issues until this started other than a idle issue at initial startup of the new combo.

JT what is a PID?

blksn955.o- I'm not sure what the eectuner guys recommend as I've been out of the loop for a long time. I don't think the FP is the issue as I used to run 40lbs with the line off, but I was running around for the first 500 miles or so on the new combo with the FP set to 50lbs. I didn't want to be lean so I ran it this way until I got my wideband hooked up and saw that I was in the low 11: 1 range at WOT so I've been backing it down a few lbs at a time until I get it into the high 12 to low 13 range, then I'll use the EEC Tuner to adjust the pulsewidth and WOT fuel multipliers.

I have not pulled any codes yet as I can not find my scanner and I couldn't buy one this weekend as no one had any.

It definitely is running rich when this problem occurs as indicated by my wideband, it seems like there is no spark to ignite the mix.

By nosing over I mean it acts like it is flooded or stalling while driving it.

I drove it Thursday and Friday with no issues. Friday night all I did was change the oil and play with the EEC settings (which are very minor, I have not changed much at all) and now I have this issue. I did pull on the serial cable a bit when I was tuning with it, maybe that is causing some sort of issue??? I tuned it from the driver's seat and the cord was stretched as far as it would extend for me to do it from there. I know the tunes are taking though as I have retrieved the modifications and they are all there like I commanded them to be, so the eectuner is getting and storing the tune. Maybe it has a bad connection with the EEC now though??? I hope to pull the codes tomorrow and pull the EEC out to have a look at it.

Rob- i didn't have a chance to work on the car tonight at all.