[the88-5.0]

So i just got my 1st sn95 (bone stock)5.0 stang, 109xxx baught off the orignal owners(elderly couple), now to the issue 1st time i took it on the freeway hit the cruse controll and a few seconds later CEL came on, turned it off the light stayed on for a few min. then went off. got home pulled the code came up as secondary fuel circuit failure. one week later came home for lunch went to leave got in it started then dies. started back up but was barley running.
took the gilfriends car came home started it and it ran fine...for about 30 seconds, fuel pressure was jumping from 45 to 50psi. threw a new regulator on evened out at 40psi, still ran like S*** tho. After testing the MAF voltage and OHMS were high on it. threw a new on and it runs great...as long i have my foot in it. And now it will throw an EGR code for about 15 Seconds when im crusing on the highway and my voltage is jumping at idle.
things ive check: EGR, vacuume leaks, IAC, ACT, TPI.
Not sure what else to check any help would be greatly appriciated thank you in advance.
Also forgot to mention the car sat for 2 years other that taking it to get it smoged.

[wizwrath]

From the beginning, it sounds like a electrical issue. Check all your wiring, especially including grounds, also your under hood fuse box connections....then check your CCRM box for connection issues too....double check your grounds near your ECU...clean all wiring contacts and especially grounds...

[Bullitt95]

Originally Posted by the88-5.0 Also forgot to mention the car sat for 2 years other that taking it to get it smogged.

Better make sure that some of your wiring hasn't been chewed at by rodents while the car was sitting around.

[99FiveOh]

What is your fuel pressure doing while under load? It's easy for a faulty pump to supply enough pressure to the rails at idle. You need to be able to watch the fuel pressure gauge as you drive it.

I had a 95 that had sat for 3 years and when I got it on the road it did the same thing. Would idle fine all day long but as soon as I put it under any kind of load it would start stumbling and would sometimes stall out.

Yours sitting for 2 years leads me to suspect the fuel pump.

[the88-5.0]

Thanks guys ill deffinatly start going thru wiring tonight after work and keep up you all updated.

[the88-5.0]

Alright not even 5 minuits into checking my ground found that my ground comming off the side of my block next to the water pump has power going to it going to it! off to tackle this porblem thanks again guys