Have a 2001 Mustang GT Convt.
I have changed my fuel pump, I changed all 8 spark plugs and also all 8 ignition coils what else can I do...my car hesitates when I take off and studders a lot.
What can it be? What else can I do ?

 

Tried cleaning the throttle body?

 

Ok what would be the next step if that doesn't work.
I just don't wanna be spending a lot of money

 

Ad the idle air control as well as your mass air

 

most likely your mass air sensor is dirty or faulty

 

No check engine light?

 

^this^

 

Also do fuel filter if you havent already

 

+1 sounds like a dirty mass air sensor , my car was there the same thing when it was bone stock and once it was cleaned it was a night and day difference !!

 

I would do the maf cleaning like the others stated. If it doesn't work then I would look into getting it checked on a computer and taken for a drive so they can check the paramiters, etc or some shops have a unit that will plug in and you can drive it for a day or two and it will log data. you could have a sensor that is a having a voltage issue or something along those lines that may be tricky to pin point.

 

How do you clean,the maf??

 

Advance auto parts has a cleaner spray that does the jobs nicely. Don't use brake parts cleaner it leaves a residue that will make your problem worse

 

I use brake clean all the time.. read the can. A good quality brake clean states on the can that it leaves no residue.

 

What mods do you have done and what type of fuel are you running