Hello,

I have a 1998 Ford Mustang GT with automatic transmission and around 120,000 miles. I have replaced the fuel filter 6 months ago and the car ran fine. Now it started to shake every now and then. As I was on my way to school, the car started to sputter and then go away as I went up a hill going no more than 40 mph. However, it ran ok on the freeway. Now, on the freeway it starts to sputter and go away and then come back again at speeds above 55 mph. On surface streets it sputters and shakes a little, and then goes away and then comes back. Any suggestions on what might cause this or what to look for? Thanks!

 

Just start with the basics- plugs, wires, air filter. I am not well versed with the 4.6L myself, but take a look under the hood too- anything out of place- vacuum lines, wiring- either cracked, freyed, not connected to anything (although you will find unconnected electrical connectors for accessories you dont have). then you can delve further- check the spark plugs; is the throttle body clean, and/or the mass air sensor? Make sure you know how to clean them properly first. These are non specific things you can check first.

 

sounds like a vacuum line

 

Mine was coughing and crap about 2 years ago! I did a complete tune-up! Oh yeah, my MAF was what was bad. I found that after I did the other stuff. I needed it done though!