help please?

[95marcos]

i have 95 mustang gt almost stock besides mach equal length headers h pipe bbk cold air intake underdrive pulleys and recently i had a fuel issue so i picked up a new fuel pump 155lph cuz i had a problem with the fuel pressure so i installed it and the car ran great had really good accelaration but then the next day it ran like shit very sluggish it seems like every time i install a part it runs real good then after a while it goes sluggish again please help any advice well help thanks

 

[eliyarbrough]

1st off, I know nothing about anything! Have you checked your MAF, though. Not sure why it's running OK then to bad. Mine was always running bad. I did a full tune-up, didn't help @ all. Replaced the MAF, ran like a champ! Sorry, that's the 1 bit of advice I have now.

On mine, the mechanic thought it might be a fuel pump issue. Wasn't though, is why I type this.

 

[94 DropTop]

Have you checked your fuel pressure. Your reg may have went bad.