Okay guys. What could it be?

[coupe]

Have checked for vacuum leaks...will check again.
Exhaust buttoned up pretty well.
Very good condition, it's probably got 150k miles, but very good condition, no oil consumption, smoke, or such. Last time i had intake off, there was a bit of carbon on a couple intake valve heads, but not too bad. The thing is generally running beautifully...hauls ass until it's at operatiing temp...then I have to be soft with it...that's the only catch. What would cause it to only be doing this at operating temps...ie: when the engine is warm (CTS reading above like 170º)
And I'm too afraid to see if WOT solves the issue...it is doing it only at part-throttle...but so badly that I'm afraid of head-gasket problem by flooring it.
WOT when it's still cool --> runs fine great, no missing at all.

[slvrbullit]

I know you installed a new dizzy, but did it come with an new TFI module. The more I think about it and I just read an article that the foxes were notorious for TFI gettin heat soaked and after getting to operating temp causing crazy drivability issues.

A friend of mines car would run and then all of a sudden just quit. After the car sat for about 15 minutes it would start right up. Replaced the TFI and the problem went away.

[coupe]

New TFI on there...it ran no differently with a new distributor and TFI...and all the other stuff I've thrown at it...
Thankfully I've not spent a fortune on this problem yet...gotten the "hookup" on most of the stuff...

[93Cobra#2771]

I don't think it would be the TFI or it would be doing it at times other than just WOT.

What about the 10 pin connectors - have you had them apart and checked for good connection? They can cause all sorts of odd things to happen. It's a good idea to go through them and spread the male connectors apart with a nail or pin so they'll get good contact.

Have you pulled a plug or two just to see how they look?

[coupe]

yea. Read about the 10-pins somewhere. They are in great shape. Not dirty, good looking connections, etc.

Again, this thing is doing this pinging about 1/4-throttle...less if going up a hill, so it's definitely in the load calculation. MAF?

[QWKSNKE]

Originally Posted by coupe

. MAF?

I would be willing to bet that it is

[93Cobra#2771]

That's what I'm starting to lean toward as well...

[coupe]

Connections to MAF look good. I do have the filter directly on the meter because the idle surged with the cold-air elbow...but it also pinged with the elbow on there; I tried that already. Why would a stock-electronics MAF degrade suddenly?? I cleaned the tiny sensor elements. They are not prone to internal electrical failure are they?!
I hate to buy a new one when I'm going to Speed Density later anyhow.

[QWKSNKE]

Originally Posted by coupe

Connections to MAF look good. I do have the filter directly on the meter because the idle surged with the cold-air elbow...but it also pinged with the elbow on there; I tried that already. Why would a stock-electronics MAF degrade suddenly?? I cleaned the tiny sensor elements. They are not prone to internal electrical failure are they?!
I hate to buy a new one when I'm going to Speed Density later anyhow.

Is the auto in the car now? if so, it may have made the symptoms magnify. you couldn't feel it before because the pinging might have only been very slight. With the auto in place it will load the motor up more.

if the auto is not in now, then i don't know

[coupe]

Auto is in now, but it did it bad with 5-speed...no difference. Again, it started doing this around November(?) and I dealt with it during winter, replaced tho parts mentioned, and did the Auto last week.