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I had no idea, I also didn't get an email notification of your or other replies

Went to fix the inop speedo, found that the cable at the trans had been cut, and the VSS removed, and plugged. I replaced that with a new one and red gear to match the 3.73 gears. That help a bit with getting the idle to settle down. And now I know how fast I'm going.

So I replaced my fuel pump with a 255lph and the fuel filter, good thing too, it was zip tied to the sending unit, there were all kinds of trash in the tank, a old pickup sock, and chunks of plastic, the fuel filter was held on with more zip ties, and the locking clips were broken and ziptied to...

I reset base idle from 1000 to.around 700, and 8 rechecked the idle voltage, it had jumped back up to 1.1 . I flipped the tps 180° where it allowed a bit more sweep, and seems to be holding at .98, but I can't go any lower. I did a sweep test, and it's solid, no dead spots. I did however...

Ok, I have checked it in the past, but I rechecked my base tps voltage and it was at 1.01v, so I backed it back down. But last I checked it was still below 1v, so unless it moved on me, it's maybe not holding a consistent voltage?

A positive update! The pickup was bad in the distributor, cause the car to die. I picked up a new one, and after chasing down a bad "new" tfi that came on the dizzy, she runs again. Not only that, but my high rpm dead spot seems to almost be gone. Instead of it quitting violently at...

New development.... Went to test my fuel pressure, fired the car up after hooking up the gauge, no leaks, and it ran for about 30 seconds, then died. Restarted, and ran long enough to get around to look at the pressure gauge, then died. Did that 2 more times then no fire. Gauge read 40...

I swapped in the smaller MAF. It improved the surging idle quite a bit, not 100% gone yet, but close. Now I need to get the idle down below 1000 rpm. Iirc isn't it, that you pull the throttle position sensor plug, and with it running set your base idle screw?

It's all going away. It's too small anyway. I'm guessing the PO bought some cheap kit and made it work.

@Mustang5L5 I found a used one on eBay, but I'm having trouble crossing the PN for a new replacement. Is that meter out of a 94-5 5.0 mustang? Or a 4.6 car? Or Lincoln of some sort?

The mismatched diameter was my main concern, but when I originally started looking at it, I thought the TB was smaller then the MAF, not the other way around. Lol It's worth a shot, I already have it. And I can always resell it later. As for the cutting out at half throttle under heavy...

Side note, all of you have been extremely helpful, many thanks all around!

I have a 55 maf with sensor in it I picked up thinking the one installed was not matched to the diameter of the TB. But looks like it is now useless. So I'm guessing the smaller sensor is getting saturated prematurely?

I was going to say the sensor wasn't what you put up, but you beat me to it. Lol

I've done that when I was looking for dead spots. It tested ok. So I'm guessing that I have an upgraded maf and tb I didn't know about. Is it the maf housing or the sensor that is calibrated for the # injectors?

I'm not sure what it is, I do know that the tps mount has a billet piece that seems to correct the placement of the tps over the tab.

Not off hand, but they seem to be for sale often

Well I take it back, it's not a stock TB, still not sure on the maf housing. With my metric tape measure, they look to be about 75mm at the opening, and not much smaller at the blade. So either 70 or 75mm. The MAF looks to be the same, and other the the PO silicone in the intake pipe and a...

I checked the fuel pressure yesterday and engine codes as well. With the pump on, car off I'm getting 41psi. I haven't got a chance to check it while driving yet. As for codes I have an egr, fuel relay, evap code. All of these have been removed from the car or bypassed. No MAF codes though

I'm not sure, it's smooth bore, no neckdown like the fox maf, and has a 4 bolt square flange on the intake side.