94 mustang misfire

[Jevonn Madaus]

Alright so I have a weird issue and I'm running out of ideas.

I have a 94 cobra that has been fully rebuilt. Has about 3000 miles on it and everything ran perfect until I let it sit for a month(40 degree weather)
It has a vortech v3 and is tuned also has msd 6a box
My car will start and then die immediately
I can get it running by feathering the gas but it runs extremely rich and rough like multiple misfires
One thing I've noticed is that when I turn the key to ON the radiator fan runs on high and the fuel pump sounds different. It has a walbro 255 so I'm able to hear it pretty well.. it used to prime for normal 3-4 seconds. Now i can here it prime(not as loud) and it doesn't stop priming. I was thinking maybe it's bad fuel pump but my fuel pressure is still good even when trying to start it and when it's running really rough.
I've checked for vacuum leaks as well and found none.
Timing is good
I'm starting to think maybe I have a bad PCM..

Parts that are new:
Spark plugs/wires
Cap rotor
Distributer
TFI module
O2 sensors
ECT sensor
CCRM
MAF sensor
Intake Air Temp sensor

Really need some help!

 

[muzzy25]

hi mine done some wierd stuff ? used to be in a garage left out side for a couple off days
done same fan come on stalled cut out driving ?
removed chip fixed it
used electrical grease on terminals chip connector and been ok

 

[muzzy25]

Another thing it done started engine
Fan come on engine climbed in rpm
Injectors pulsed more black fuel smoke out off exhaust and died first start Ln morning
After noon ran fine
Must of had moistor on terminal?

 

[Jevonn Madaus]

Another thing it done started engine
Fan come on engine climbed in rpm
Injectors pulsed more black fuel smoke out off exhaust and died first start Ln morning
After noon ran fine
Must of had moistor on terminal?

Hopefully it's not the computer.. that would mean I would need to get it re tuned.. it's going to a performance shop in a couple weeks so I won't know until then hopefully it's something easy I overlooked

 

[muzzy25]

I pulled out tuner clean contacts
Clean contacts
Re install tuner
Don't think ecu
Mine had not a good contact between tuner and j port

 

[ttocs]

what is the fuel pressure showing?

 

[Jevonn Madaus]

It stays at 38-39psi

 

[Jevonn Madaus]

**FIXED** Turned out to be the chip. Had to get a new chip and tune, runs like a champ again.

 

[Jevonn Madaus]

I pulled out tuner clean contacts
Clean contacts
Re install tuner
Don't think ecu
Mine had not a good contact between tuner and j port

You were right

 

[muzzy25]

Cool I have removed my chip trans was changing gears up and down while driving