1998 Mustang GT won’t stay running.

Blue2v said:

I have a 1998 Ford Mustang GT with a 2005 Crown Vic engine. The car was running flawless when I parked it one night. The next morning I went too start it and it barely starts up. Battery and alternator are good. Once it starts running it runs really rough and will shut off if I touch the throttle at all. It’s almost like it is losing vacuum. Is there any specific places I should be looking for leaks or what is the easiest way to find the leak?

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• what the fuel pressure is
• What the MAF flow is. Does the MAF flow change during cranking or when the throttle is advanced? Does it make any difference IF the MAF is disconnected?
• What is the PCM operating mode (open or closed loop)?
• What is the battery voltage?

Blue2v said:

I have a 1998 Ford Mustang GT with a 2005 Crown Vic engine. The car was running flawless when I parked it one night. The next morning I went too start it and it barely starts up. Battery and alternator are good. Once it starts running it runs really rough and will shut off if I touch the throttle at all. It’s almost like it is losing vacuum. Is there any specific places I should be looking for leaks or what is the easiest way to find the leak?

Click to expand...