fuel/performance

[Stang67401]

hey guys ill keep it short and sweet again, just had a quick question. im sure its either my fuel pump/filter thats going out. just having a hard time figuring which one it is heres a few symptoms...

---to start my car effeciently i have to cycle my key a couple times for it to fire up good(if i dont it usually takes awhile for it to start)
---i have a loss of power everytime i floor it, car struggles to even move(everytime i do this the battery guage jumps down too)
---it drives fine just doing normal driving, but everytime i come to a stoplight the battery jumps down again. it idles fine in park though

If you guys think its maybe something else that i should look into please let me know, any input is appreciated! thanks guys!

 

[toyman]

I would first check the main power leads (battery to fuse box and alternator) and the battery to engine and engine to chassis grounds. They must be absolutely solid before you can make any assessment about any electrical component.

 

[CC'S95GT]

As a precaution I'd definately change the fuel filter.
Could be bad fuel pressure regulator too.
Could be clogged cats. How many miles on the car?

 

[MustangChris]

sounds more electrical than fuel... check the battery, the alt, inspect your belt.

is it throwing any codes?