I finally pulled codes and have with engine off 72 and 73 and with running it was pulled a 72 ,536,538. And a 632 and I found several different lists not sure which list applies to my truck

 

You will not get a mix of two and three digit codes. It's one or the other. A 1996 model year should have three digit codes. Some readers will interpret the Separator flash as Code 10, but it is just that...a Separator flash between the KOEO code display and the stored code display.

 

I didn't use a reader I used a jumper wire I had a flicker then a 1 then a pause the the 72 and 73 with engine off now the pause was long enough to not be a 172 and 173 the pause is long very long all the other codes came with engine running I imagine the throttle and over drive codes were because I didn't click the overdrive on or off and didn't touch the accelerator but one of them is lean I believe but like I said I found two sets of codes both claim to be for my truck one doesn't list half the codes I believe it's for a mustang now if it is indeed a 172 and 173 that's rich and lean would that be o2 sensor??? And the defroster was on that is why the ac code is there but on the list that shows them this way it doesn't list a code 632 and it flashed 632 twice

 

Since you list two and three digit codes, any and all are misinterpreted. You will end up on a wild goose chase speculating and it will be very dangerous to your wallet thickness.

Assuming 632 is valid: DTCs 632 and 653 indicate the Transmission Control Switch (TCS) was not cycled between engine "ID Code" and the "Goose Test" in Key On Engine Running (KOER) Self-Test.

 

As I said I was going to run it again the cel was giving issues with a bit of a flicker and then two digits but this time I got 1-1 on koeo and then koer I got 172-538-536 then it repeated this is after a 25 minute drive home where it fell on its face on the highway on ramp and cleared up and did 75 no problem but sometimes it falls on its face and doesn't clear up for quite a while this time the test goosed the throttle for me and I cycled the overdrive button on and off I am guessing because I didn't touch the brake pedal or rev it myself I got the 536 and 538 the other 172 possible O2 sensor but would the O2 sensor really drop this truck on its face randomly?

 

I believe I only have one O2 sensor right where the Y pipe connects to the massive catty but I may be wrong I haven't climbed under to look yet

 

536 and 538 are both simple user error and not an issue.

172 shouldn't cause it to fall on its face due to a failed O2 sensor, it would fall on its face though if fuel pressure at times drops significantly and then causing that lean code.

Connect a fuel pressure gauge to the fuel rail, take it for a ride with the gauge set so you can see it from the drivers seat. Might not come to that, not if fails pressure tests sitting at idle.

Should be 30-45psi at idle, rises 5 to 10psi when vac line to FPR is disconnected and plugged (just put your thumb over the end of the vac line a while taking reading)

And yes a single O2 and the sensor located where you stated.

 

I would imagine it is regulator related because it does it on either tank I will have to check this Friday when I'm off work with a gauge thanks for the info I hope it shows a sign

 

Havent had a chance to even look at the issue as my radiator gave up the ghost and im swamped with work. Will update soon as I can touch the poor girl.

 

Did the radiator finally still haven't had time to check the pressure been so busy I have found if both tanks are full and I run off the back one first it starts pumping fuel into the front and once it's full blows out the full tube , the truck still does this random fall on its face today it was going 35 in the industrial park heading home and just fell on its face I tried to pedal it to see if it would clear out but it was like a car with the choke closed it did nothing would t even rev up then cleared out and was fine all the way home

 

Get a pressure gauge on it!

 

I plan to I just need more than 5 minutes to do it lol